All language subtitles for S16E07 - Audio Vacuum Tubes; Light Bars; Wood Model Aircraft; Metal Snare Drums (1080p AMZN WEB-DL x265 Garshasp)_track3_[eng]
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Narrator: when it comes
To sound quality,
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Audiophiles swear
By amplifiers which contain
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00:00:55,896 --> 00:00:59,172
Vacuum tubes to boost and modify
The electrical signal.
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00:00:59,172 --> 00:01:01,793
They were the norm until
Transistors came along
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00:01:01,793 --> 00:01:03,793
In the 1950s.
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00:01:03,793 --> 00:01:06,413
Many audio enthusiasts still
Prefer tube sound,
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00:01:06,413 --> 00:01:10,931
Which they find warmer, richer,
And more natural.
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00:01:10,931 --> 00:01:13,241
[ mid-tempo music plays ]
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00:01:18,689 --> 00:01:22,344
Once standard in radios,
Phonographs, and televisions,
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Today you see vacuum tubes only
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00:01:24,103 --> 00:01:26,448
In very high-end
Audio equipment.
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00:01:26,448 --> 00:01:29,586
They come in an array of models
Designed to perform specific
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00:01:29,586 --> 00:01:31,551
Sound-enhancing tasks.
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00:01:34,137 --> 00:01:37,103
Technicians at this czech
Factory first wind wire
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00:01:37,103 --> 00:01:39,310
A precise number of revolutions
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00:01:39,310 --> 00:01:41,620
With a very specific degree
Of tension.
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00:01:43,000 --> 00:01:47,310
Then they clean the surface and
Weld it to a support structure.
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00:01:47,310 --> 00:01:52,103
This completes the grid, one of
The tube's main components.
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Next, technicians take
The second main component,
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00:01:55,689 --> 00:01:58,724
The cathode,
And insert it into the grid.
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When the sound signal
Enters the tube,
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00:02:00,931 --> 00:02:03,931
The cathode produces
A flow of electrons.
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00:02:03,931 --> 00:02:05,620
The grid controls that flow
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00:02:05,620 --> 00:02:09,103
As it travels to the third
Main component, the anode.
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00:02:09,103 --> 00:02:11,241
The anode's top secret
Black coating
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00:02:11,241 --> 00:02:13,896
Increases the effect of
The electrons hitting it,
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00:02:13,896 --> 00:02:17,862
Causing the anode and cathode
To have two different voltages,
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00:02:17,862 --> 00:02:21,103
Both of which are greater than
That of the original signal.
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00:02:21,103 --> 00:02:23,931
This makes the signal larger
And more powerful,
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00:02:23,931 --> 00:02:26,482
Meaning it amplifies the sound.
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00:02:26,482 --> 00:02:29,827
With those three components now
Assembled into one unit,
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The inside structure of the tube
Is complete.
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00:02:33,000 --> 00:02:36,379
Now for the bulb,
Which will encase the unit.
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00:02:36,379 --> 00:02:38,379
A glass blower skillfully crafts
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00:02:38,379 --> 00:02:41,206
It out of hard,
Laboratory-grade glass.
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00:02:41,206 --> 00:02:44,206
Using a high-temperature torch
And glass-making tools,
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He melts the open end
And seals it off.
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00:02:48,586 --> 00:02:50,586
Then he blows in a bit of air
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00:02:50,586 --> 00:02:55,103
To shape the end into an evenly
Rounded dome.
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00:02:55,103 --> 00:02:59,517
Now he mounts the bulb on a
Lathe to complete the shaping.
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00:02:59,517 --> 00:03:01,896
Keeping the glass evenly heated,
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00:03:01,896 --> 00:03:04,275
He blows in just enough
Air pressure to keep the bulb
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00:03:04,275 --> 00:03:06,172
From collapsing inward.
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00:03:06,172 --> 00:03:08,793
When the glass reaches
Just the right temperature,
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00:03:08,793 --> 00:03:13,275
A die presses against it,
Setting the final shape.
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00:03:15,206 --> 00:03:17,448
Next, they mount a glass collar
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00:03:17,448 --> 00:03:20,862
Over copper wires clamped
Into a motorized vice,
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00:03:20,862 --> 00:03:25,413
Then insert a glass straw called
An evacuation port.
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00:03:25,413 --> 00:03:28,137
As the vise rotates, they heat
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00:03:28,137 --> 00:03:31,551
The collar uniformly
With stationary torches.
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00:03:31,551 --> 00:03:33,206
Using a handheld torch,
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00:03:33,206 --> 00:03:37,310
They remove any stretches or
Runs in the softening glass.
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00:03:37,310 --> 00:03:39,827
When the time is right,
They activate a die
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00:03:39,827 --> 00:03:42,172
To press the glass
Into the final shape.
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00:03:42,172 --> 00:03:44,068
This completes the stem on which
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The tube's inside
Structure sits.
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00:03:46,758 --> 00:03:49,103
The wires protruding
From the top of the stem
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Connect to the
Structure's terminals.
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00:03:54,758 --> 00:03:58,103
Now they put this assembled unit
On a turntable
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00:03:58,103 --> 00:04:00,413
And center the bulb over it.
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00:04:06,551 --> 00:04:11,103
As the turntable revolves, they
Heat the bottom of the bulb.
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00:04:11,103 --> 00:04:13,689
As the glass melts,
They press it inward,
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00:04:13,689 --> 00:04:15,310
Fusing it to the stem.
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00:04:24,551 --> 00:04:27,965
They remove the excess glass
And continue heating
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00:04:27,965 --> 00:04:30,379
To ensure the bottom
Is fully sealed.
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00:04:32,137 --> 00:04:35,724
Next, they prepare
To suction out the air.
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00:04:35,724 --> 00:04:38,620
This step is critical
To the tube's performance,
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00:04:38,620 --> 00:04:42,068
Because air molecules
Hinder the flow of electrons.
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Technicians fuse the tube's
Evacuation port
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To the glass evacuation line
Of a vacuum pump.
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00:04:47,793 --> 00:04:51,103
The pump then extracts the air
Through the port.
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00:04:51,103 --> 00:04:54,413
At the same time, they heat
The tube in a pull-down oven.
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00:04:54,413 --> 00:04:56,896
This increases pressure inside
The tube,
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00:04:56,896 --> 00:04:58,965
Creating a stronger vacuum.
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00:04:58,965 --> 00:05:03,103
Next, they run an inductive
Heater over the tube.
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00:05:03,103 --> 00:05:05,482
This dislodges damaging
Impurities,
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Enabling the vacuum pump
To draw them out.
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00:05:08,448 --> 00:05:11,689
They target the stem area
With a second inductive heater
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To draw particles called ions
Onto the glass permanently
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00:05:15,310 --> 00:05:18,517
So that they can't later
Damage the tube.
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00:05:18,517 --> 00:05:21,413
Finally, they connect
The protruding wires
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To a plastic plug-in base.
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00:05:23,896 --> 00:05:26,482
There are subtle technical
Differences between tubes
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Of the same model.
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So the factory tests each tube,
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Then matches pairs with similar
Performance features.
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This ensures they'll amplify
Sound evenly.
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Narrator: a light bar is that
Strip of flashing lights on top
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Of a police car
Or emergency vehicle.
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00:05:56,620 --> 00:05:58,689
The lights are
High-output l.E.D.S,
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00:05:58,689 --> 00:06:01,413
Far more efficient and
Durable than incandescent
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00:06:01,413 --> 00:06:04,620
Or quartz halogen bulbs
Or strobe tubes.
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00:06:04,620 --> 00:06:06,137
The mounting system is designed
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00:06:06,137 --> 00:06:09,379
To withstand emergency
High-speed driving.
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00:06:09,379 --> 00:06:12,034
[ siren wails ]
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00:06:12,034 --> 00:06:15,862
The l.E.D.S are grouped by color
Within a module.
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00:06:15,862 --> 00:06:18,413
Modules can be arranged
In any configuration
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On the light-bar base.
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00:06:20,068 --> 00:06:22,206
The base mounts
To the vehicle's roof
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Via straps made of
High-strength stainless steel.
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Those straps begin
As flat pieces,
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Laser cut to
A starting shape.
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00:06:31,068 --> 00:06:34,689
A 50-ton forming press bends
Them to the final shape,
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00:06:34,689 --> 00:06:40,172
Which fits the exact contour
Of the vehicle's doorjamb.
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00:06:40,172 --> 00:06:43,689
The light bar's white light
Modules fasten onto the base
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00:06:43,689 --> 00:06:46,827
With the aluminum brackets
This worker is assembling.
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00:06:46,827 --> 00:06:48,655
These brackets also help draw
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Out the heat the lights
Generate.
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This is critical, because if
L.E.D.S overheat, they burn out.
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The base is made
Of extruded aluminum.
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00:06:58,517 --> 00:07:02,551
This computer-controlled laser,
Working on six bases at a time,
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00:07:02,551 --> 00:07:05,551
Cuts out holes for venting
And cables.
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00:07:05,551 --> 00:07:09,344
The light bar has two cables --
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00:07:09,344 --> 00:07:12,241
One running power
From the vehicle's battery
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00:07:12,241 --> 00:07:14,206
To the light bar
And another connecting
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00:07:14,206 --> 00:07:15,896
Control switches
On the dashboard
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00:07:15,896 --> 00:07:18,517
To the light bar's
Electronic control board.
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00:07:18,517 --> 00:07:21,724
An automatic machine measures
And cuts the required length
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00:07:21,724 --> 00:07:24,862
Of each cable, then strips off
A specific amount
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00:07:24,862 --> 00:07:28,310
Of the pvc outer jacket
At both ends.
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00:07:28,310 --> 00:07:30,586
This exposes three wires,
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00:07:30,586 --> 00:07:35,586
Two of which are insulated
And inside a foil wrap.
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00:07:35,586 --> 00:07:38,000
After stripping off the foil,
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00:07:38,000 --> 00:07:41,344
An automatic stripping machine
Removes some insulation,
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00:07:41,344 --> 00:07:46,275
Bearing the tin-coated
Copper wire within.
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00:07:46,275 --> 00:07:49,931
Workers put contacts
Onto two of those wires --
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00:07:49,931 --> 00:07:52,827
The ground and the power --
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00:07:52,827 --> 00:07:54,931
Then press the contacts
On securely
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00:07:54,931 --> 00:07:57,689
With a crimping device.
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00:07:57,689 --> 00:08:01,310
Next, they connect a terminal
To the third wire,
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00:08:01,310 --> 00:08:02,896
The shield drain.
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00:08:02,896 --> 00:08:05,344
This wire reduces electronic
Interference
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From sources like
The police radio.
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00:08:07,793 --> 00:08:10,103
Now for the l.E.D.
Light modules,
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The main component of
Which is a reflector.
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00:08:12,862 --> 00:08:16,379
They put the reflector's plastic
Body into the sealed chamber
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00:08:16,379 --> 00:08:18,034
Of a metalizing machine.
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00:08:18,034 --> 00:08:20,896
The machine then releases
Argon gas
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00:08:20,896 --> 00:08:23,137
While applying hundreds of
Volts of electricity
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00:08:23,137 --> 00:08:25,379
To a solid piece of aluminum.
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00:08:25,379 --> 00:08:28,206
This vaporizes the metal
Into tiny particles,
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00:08:28,206 --> 00:08:30,758
Which a vacuum draws
Onto the plastic body
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00:08:30,758 --> 00:08:34,344
In an ultra-thin reflective
Coating.
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00:08:34,344 --> 00:08:37,137
To broaden the horizontal range
Of the reflection,
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00:08:37,137 --> 00:08:41,965
Workers install a device called
A collimator.
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00:08:41,965 --> 00:08:44,551
Then they take an l.E.D. Light,
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00:08:44,551 --> 00:08:47,379
Put an electric insulator
On the back of it...
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00:08:49,620 --> 00:08:52,931
And mount it inside a housing
That's specifically designed
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00:08:52,931 --> 00:08:55,586
To remove heat from the l.E.D.S.
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00:08:55,586 --> 00:08:58,000
Then they install these
Assembled light components
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00:08:58,000 --> 00:09:01,275
In the reflector...
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00:09:01,275 --> 00:09:03,517
Install the connector that plugs
Into the wire harness
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00:09:03,517 --> 00:09:05,620
That leads
To the control board...
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00:09:08,310 --> 00:09:10,724
...And test the finished module.
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00:09:22,000 --> 00:09:23,862
To assemble the light bar,
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00:09:23,862 --> 00:09:25,896
They slide the control board
Onto the base,
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00:09:25,896 --> 00:09:29,137
Plug in the control cable
That connects the board
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00:09:29,137 --> 00:09:31,034
To the dashboard switches,
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00:09:31,034 --> 00:09:32,827
Install the power cable
That runs
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00:09:32,827 --> 00:09:35,068
From the vehicle's battery
To the light bar,
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00:09:35,068 --> 00:09:38,206
And the wiring connecting
The lights to the board.
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00:09:41,172 --> 00:09:44,310
After mounting the white light
Modules on the brackets
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00:09:44,310 --> 00:09:46,482
And securing them to the base,
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00:09:46,482 --> 00:09:48,827
Workers take the colored
L.E.D. Modules
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00:09:48,827 --> 00:09:51,758
And slide them onto
The tracks on the base.
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00:09:54,965 --> 00:09:58,586
They make the internal
Connections
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00:09:58,586 --> 00:10:00,586
To the control board,
168
00:10:00,586 --> 00:10:02,275
Then plug each module into
The control board harnesses.
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00:10:02,275 --> 00:10:05,310
After testing to make sure
Everything works properly,
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00:10:05,310 --> 00:10:07,862
It's just a matter of encasing
The modules,
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00:10:07,862 --> 00:10:10,034
Starting with an aluminum top,
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00:10:10,034 --> 00:10:12,931
Then slide on transparent
Plastic lenses
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00:10:12,931 --> 00:10:15,379
With divider gaskets in between
174
00:10:15,379 --> 00:10:18,931
To prevent rain from penetrating
And shorting out the light.
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00:10:20,413 --> 00:10:22,931
A cap closes up each end.
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00:10:29,241 --> 00:10:31,034
After a final round of testing,
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00:10:31,034 --> 00:10:36,068
The light bar is ready to hit
The roof and the road.
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00:10:50,517 --> 00:10:54,137
Narrator: flying a wood model
Aircraft is a way to experience
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00:10:54,137 --> 00:10:57,000
The adventure of flight
On a small scale.
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00:10:57,000 --> 00:10:59,620
But there's a lot to do
Before takeoff.
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00:10:59,620 --> 00:11:02,241
These miniature planes
Usually come in kits
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00:11:02,241 --> 00:11:05,103
That can take dozens of hours
To piece together.
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00:11:05,103 --> 00:11:07,793
But, of course, that's just part
Of the fun.
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00:11:12,310 --> 00:11:15,241
Wood model planes are part
Of aviation history.
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00:11:15,241 --> 00:11:18,206
The first real flying machines
Were made of wood,
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00:11:18,206 --> 00:11:20,103
And soon
After their invention,
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00:11:20,103 --> 00:11:24,482
People began building miniature
Wood replicas in kit form.
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00:11:24,482 --> 00:11:28,448
Today modern manufacturing
Techniques take the concept
189
00:11:28,448 --> 00:11:31,068
To a whole new level.
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00:11:31,068 --> 00:11:34,517
Production begins with blocks of
Wood that circle on a system
191
00:11:34,517 --> 00:11:36,827
Of conveyors.
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00:11:36,827 --> 00:11:42,551
Each time around, a long blade
Slices away a thin piece.
193
00:11:46,206 --> 00:11:48,724
They transfer the sheets of wood
To a table
194
00:11:48,724 --> 00:11:51,137
That moves in a
Computer-choreographed sequence
195
00:11:51,137 --> 00:11:53,827
While lasers overhead make cuts.
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00:11:59,620 --> 00:12:02,344
This computerized system
Produces parts
197
00:12:02,344 --> 00:12:03,862
That will fit
Together perfectly,
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00:12:03,862 --> 00:12:06,310
No matter
How intricate the design.
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00:12:09,379 --> 00:12:11,068
To assemble the kit at home,
200
00:12:11,068 --> 00:12:14,379
The modeler extracts
The precut parts.
201
00:12:14,379 --> 00:12:18,379
He then builds the fuselage
Right on top of the plans
202
00:12:18,379 --> 00:12:21,931
In order to follow them
To the letter.
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00:12:21,931 --> 00:12:24,517
After the fuselage
Has been assembled,
204
00:12:24,517 --> 00:12:26,241
He focuses on the wings.
205
00:12:26,241 --> 00:12:29,482
He braces the main spar
With numerous ribs
206
00:12:29,482 --> 00:12:31,689
To create a
Cross-sectional air foil
207
00:12:31,689 --> 00:12:34,586
That will generate lift.
208
00:12:34,586 --> 00:12:39,103
He then glues the wings' leading
Edge to the framework.
209
00:12:39,103 --> 00:12:43,586
The framework is very similar to
That of full-sized wooden wings
210
00:12:43,586 --> 00:12:45,793
Built in the early days
Of flight.
211
00:12:45,793 --> 00:12:48,172
It's made mainly
Of tropical balsa,
212
00:12:48,172 --> 00:12:51,793
A wood that's both lightweight
And exceptionally strong.
213
00:12:54,689 --> 00:12:57,379
The modeler joins the two wings.
214
00:12:57,379 --> 00:13:01,344
The tongue of one fits into the
Laser-cut slot of another.
215
00:13:01,344 --> 00:13:04,379
This joint will later be glued
To reinforce it.
216
00:13:04,379 --> 00:13:09,275
He demonstrates the next step
Using the wing of another model.
217
00:13:09,275 --> 00:13:11,931
He drapes plastic film
Over the wing's skeleton.
218
00:13:11,931 --> 00:13:13,965
He tacks the plastic to it
219
00:13:13,965 --> 00:13:17,034
And smoothes out ripples
And bubbles.
220
00:13:17,034 --> 00:13:19,379
He then heat-shrinks the plastic
221
00:13:19,379 --> 00:13:22,103
To give the model aircraft
Its tight skin.
222
00:13:22,103 --> 00:13:24,448
Of course, there's no need
For a paint job
223
00:13:24,448 --> 00:13:27,413
Because the plastic is tinted.
224
00:13:27,413 --> 00:13:31,655
Finally, he confirms
That it's drum tight.
225
00:13:31,655 --> 00:13:33,689
Back on the production line,
226
00:13:33,689 --> 00:13:36,620
They're now winding wire
To produce a spring.
227
00:13:36,620 --> 00:13:38,448
This spring is a shock absorber
228
00:13:38,448 --> 00:13:41,275
For the plane's
Front landing gear.
229
00:13:41,275 --> 00:13:43,172
With that complete,
230
00:13:43,172 --> 00:13:45,758
They now position a sheet
Of preheated plastic
231
00:13:45,758 --> 00:13:49,586
Above six molds
Of wheel covers.
232
00:13:51,931 --> 00:13:56,137
He activates a vacuum that pulls
The plastic over the molds.
233
00:13:56,137 --> 00:13:59,517
In seconds, it cools and
Solidifies into the shape
234
00:13:59,517 --> 00:14:02,137
Of the wheel covers,
Called pants.
235
00:14:07,034 --> 00:14:09,793
With the wheel pants assembled
To the craft,
236
00:14:09,793 --> 00:14:12,172
The modeler now installs
The two-stroked
237
00:14:12,172 --> 00:14:15,206
Alcohol-burning engine
In the front compartment.
238
00:14:19,551 --> 00:14:23,931
He attaches the muffler
To the engine's crank case.
239
00:14:23,931 --> 00:14:27,551
He then secures the spinner's
Back plate and propeller
240
00:14:27,551 --> 00:14:32,206
Onto the engine's driveshaft
With a washer and bolt.
241
00:14:32,206 --> 00:14:35,137
This assembly will have to
Withstand the force
242
00:14:35,137 --> 00:14:38,655
Of the spinning propeller,
So he tightens it to the max.
243
00:14:47,793 --> 00:14:52,275
And this model plane is now
Ready for flight.
244
00:14:52,275 --> 00:14:56,965
Incredibly, it started out
As a bunch of parts in a box,
245
00:14:56,965 --> 00:14:58,448
But they all come together
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In the hands of
A skillful modeler.
247
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Of course, a good set of
Instructions is essential.
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Assembling each model
Can take up to 50 hours.
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We've just shown the highlights.
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The payoff comes
When the operator
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Manipulates the
Transmitter joystick
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00:15:19,724 --> 00:15:23,206
And the parts of the plane move
Right on cue.
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00:15:24,931 --> 00:15:28,517
From fighter planes and biplanes
To civilian aircraft
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00:15:28,517 --> 00:15:31,241
And extreme
Aerobatic machines,
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When it comes to these
Historical replicas,
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The sky really is the limit.
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Narrator: the sound of a
Snare drum is unmistakable --
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A sharp rattle with
A somewhat tinny resonance.
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00:15:56,034 --> 00:15:58,310
What produces this
Distinctive sound?
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00:15:58,310 --> 00:16:01,758
It's a vibrating set of wires
Called the snare wire
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Stretched across the bottom
Of the drum.
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00:16:04,068 --> 00:16:07,275
The snare drum is the center
Of the drum kit.
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00:16:08,827 --> 00:16:11,448
[ drum music plays ]
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00:16:11,448 --> 00:16:14,896
The circular frame of a
Snare drum, called the shell,
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00:16:14,896 --> 00:16:17,068
Can be made of either wood
Or metal.
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00:16:17,068 --> 00:16:21,344
Metal shells produce a sharp,
Loud, and more brilliant sound.
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00:16:21,344 --> 00:16:23,551
The metal this german
Drum company uses
268
00:16:23,551 --> 00:16:25,206
Is known as bell bronze,
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00:16:25,206 --> 00:16:29,793
Which is approximately
78% copper and 22% tin.
270
00:16:31,068 --> 00:16:34,379
Workers first glue together
A three-part mold.
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00:16:34,379 --> 00:16:36,689
It's made of a sand
And chemical mixture
272
00:16:36,689 --> 00:16:39,206
Because sand can withstand
The temperature
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00:16:39,206 --> 00:16:40,793
Of the hot molten metal.
274
00:16:40,793 --> 00:16:45,034
The glue sets in about half
An hour, and the mold is ready.
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00:16:45,034 --> 00:16:47,379
They steady it
With heavy steel plates,
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00:16:47,379 --> 00:16:49,827
Then scoop a bucket full
Of bell bronze
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00:16:49,827 --> 00:16:53,137
From the furnace
And pour it in.
278
00:16:53,137 --> 00:16:57,655
It took four hours at
2,300 degrees fahrenheit
279
00:16:57,655 --> 00:16:59,586
To melt the metal,
280
00:16:59,586 --> 00:17:01,655
But just a few seconds
For it to solidify
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00:17:01,655 --> 00:17:05,758
Inside the mold cavity.
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00:17:05,758 --> 00:17:11,827
They let the casting cool
For a couple of hours,
283
00:17:11,827 --> 00:17:15,379
Then break the sand mold
To extract it.
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00:17:17,655 --> 00:17:21,172
They clean off the loose sand
With a wire brush,
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00:17:21,172 --> 00:17:23,724
Then ship the shell
To the drum factory,
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00:17:23,724 --> 00:17:27,034
Where its first stop is onto
An automated lathe.
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00:17:27,034 --> 00:17:31,275
As the lathe spins, a cutter
Skims off a thin layer of metal,
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00:17:31,275 --> 00:17:34,655
Making the shell's exterior
Surface clean and smooth.
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00:17:37,206 --> 00:17:41,620
Next, a computer-guided drilling
Machine bores 47 holes
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00:17:41,620 --> 00:17:43,137
For various components,
291
00:17:43,137 --> 00:17:45,344
Including fittings that hold
And adjust
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00:17:45,344 --> 00:17:47,137
The drum heads and a vent hole
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00:17:47,137 --> 00:17:49,310
That increases
The drum's volume.
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00:17:49,310 --> 00:17:52,965
Then the machine changes the
Drilling tool for a milling tool
295
00:17:52,965 --> 00:17:56,551
And makes two recessed areas
Called snare beds
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00:17:56,551 --> 00:17:59,275
In the shell's bottom edge.
297
00:17:59,275 --> 00:18:01,068
The drill left rough edges,
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00:18:01,068 --> 00:18:02,896
So they clean and smooth
The holes
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00:18:02,896 --> 00:18:05,724
With a small grinding tool.
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00:18:05,724 --> 00:18:09,310
Then they manually sand
The snare beds.
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00:18:12,724 --> 00:18:16,310
Next, they sand the shell's
Outside surface,
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00:18:16,310 --> 00:18:18,586
First with a rough
Abrasive belt,
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00:18:18,586 --> 00:18:20,482
Then with a fine one.
304
00:18:20,482 --> 00:18:24,586
This leaves the metal shiny
And silky smooth.
305
00:18:24,586 --> 00:18:28,068
Now they sand the inside surface
By hand.
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00:18:33,758 --> 00:18:37,068
Then they spray it with
Bronze-colored lacquer
307
00:18:37,068 --> 00:18:40,344
To give the metal an even color
And prevent tarnishing.
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00:18:40,344 --> 00:18:43,103
They taped over the holes
To keep the colored lacquer
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00:18:43,103 --> 00:18:45,793
From hitting the outside
Surface.
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00:18:45,793 --> 00:18:48,103
Now they remove the tape
And spray the outside
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00:18:48,103 --> 00:18:50,241
With transparent lacquer,
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00:18:50,241 --> 00:18:53,793
Which allows the natural color
Of the metal to show through.
313
00:18:53,793 --> 00:18:55,896
25 minutes in an oven hardens
314
00:18:55,896 --> 00:19:00,137
The lacquer into
A super durable finish.
315
00:19:00,137 --> 00:19:04,896
Then final assembly begins,
Starting with the tension lugs,
316
00:19:04,896 --> 00:19:07,103
The fittings that hold
And adjust the tension
317
00:19:07,103 --> 00:19:08,275
Of the drum heads.
318
00:19:10,827 --> 00:19:13,206
Next comes the action strainer,
319
00:19:13,206 --> 00:19:15,551
The mechanism the drummer flips
Up or down
320
00:19:15,551 --> 00:19:18,517
To activate and deactivate
The snare sound.
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00:19:22,551 --> 00:19:26,413
The top drum head is made of
A strong polyester material.
322
00:19:26,413 --> 00:19:30,379
A chrome-plated metal hoop will
Hold the head to the shell.
323
00:19:30,379 --> 00:19:32,896
To tune the drum to a higher
Or lower pitch,
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00:19:32,896 --> 00:19:35,310
The drummer tightens or loosens
The screws
325
00:19:35,310 --> 00:19:38,137
To increase or decrease tension.
326
00:19:38,137 --> 00:19:40,517
Drumhead tension
Determines pitch.
327
00:19:45,137 --> 00:19:49,000
The bottom drumhead is made
Of clear polyester film.
328
00:19:49,000 --> 00:19:51,172
It's much thinner
Than the top drumhead
329
00:19:51,172 --> 00:19:54,758
To enable the snare wire
To respond faster.
330
00:19:54,758 --> 00:19:56,448
That snare wire is made of
331
00:19:56,448 --> 00:20:00,931
Multiple strands of stainless
Steel, brass, or copper wire.
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00:20:00,931 --> 00:20:03,000
They stretch it across
The bottom head,
333
00:20:03,000 --> 00:20:05,724
Laying each end
On a snare bed.
334
00:20:05,724 --> 00:20:09,275
They attach the ends with nylon
Cords to the action strainer
335
00:20:09,275 --> 00:20:13,344
On one side and to a part called
The butt end on the other.
336
00:20:13,344 --> 00:20:15,758
To play the drum
With the snare sound,
337
00:20:15,758 --> 00:20:17,379
The drummer simply pulls up
338
00:20:17,379 --> 00:20:19,448
On the action strainer's
Handle.
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00:20:19,448 --> 00:20:23,551
Every drum undergoes a final
Inspection, then tuning,
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00:20:23,551 --> 00:20:26,241
And a thorough performance test.
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00:20:26,241 --> 00:20:27,413
[ drumming ]
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00:20:27,413 --> 00:20:29,517
Talk about ending with a bang.
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00:20:29,517 --> 00:20:31,758
[ drum music plays ]
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00:20:31,758 --> 00:20:34,758
--captions by vitac--
Www.Vitac.Com
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00:20:34,758 --> 00:20:37,758
Captions paid for by
Discovery communications
346
00:20:51,103 --> 00:20:53,827
If you have any comments
About the show
347
00:20:53,827 --> 00:20:56,793
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348
00:20:56,793 --> 00:20:58,482
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