F. H. Richardson's bluebook of projection (1935)

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DEFINITIONS 6" Volatilization In projection, the transforming of carbon into vapor through the action of heat. Volt The unit of electric pressure. Volt Meter An instrument for measuring voltage. It is connected across the circuit to be measured — to both wires. Watt The practical unit of electric power. Equals product of volts and amperes. Watt-Hour Energy consumed when one watt of electric power is used for the space of one hour. Watts Per Candle Power The specified power consumption of an electric light source is watts of power consumed per mean spherical candle power of illumination produced. The candle power produced per watt of electric energy applied. Wire Gauge A gauge used for measuring wire diameters according to an arbitrary standard. The measurement is in mils. The Brown and Sharpe gauge is standard for the United States. It is also known as the U. S. wire gauge. Working Aperture In projection, that portion of a lens diameter actually in use. Working Distance Distance from emulsion surface of film in a motion picture projector to nearest surface of projection lens when said lens is adjusted to produce the finest possible definition in the screen image. See Back Focus.