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Head Guy |
A guy fastened to the top of a telegraph pole.
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Henry |
The basic unit of inductance. One henry is the
inductance which induces a cemf of 1 volt when the current is
changing at the rate of 1 ampere per second.
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Hertz |
A measurement of frequency. One hertz is equal
to one inverse second (1/s); that is, one cycle per second,
where a cycle is the duration between similar portions of a wave.
HZ
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High Intensity Discharge Lamps (HID.) |
A general group of lamps consisting of mercury,
metal halide, high-pressure sodium, and low pressure sodium
lamps.
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High Voltage |
Voltage exceeds 600 volts.
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High-Pressure Sodium Lamps |
A sodium vapor in which the partial pressure of
the vapor during operation is the order of 0.1 atmospheres.
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Hoistway |
Any shaftway, hatchway, well hole, or other
vertical opening or space in which an elevator or dumbwaiter is
designed to operate.
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Hot Cathode Lamp |
An electrical discharge lamp whose mode of
operation is that of an arc discharge.
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Hydroelectric Power |
Power produced by using the power of water to
turn the shaft of a generator.
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