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Illumination and Brightness Measurement
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accuracy accurate adjusted aircraft alternating current amplifier angle anode anode current applied automatically axis balance beam Betatron brightness calibrated camera capacitance cathode ray cathode ray tube cell Chapter circuit clock coil condenser connected crystal designed diameter direction disc electrical electrons extensometer film frequency galvanometer glass grid humidity image converter inch indicator infra-red input lamp lens lenses lever light load measured mechanical ment meteorological meter method mirror motor mounted moving obtained operation optical oscillator output pendulum photocell photographic photometer plane plate pointer position potentiometer pressure principle produced proportional pulse Quartz Clocks radiation radio radio-sonde range recording reflected relay resistance rotation scale Scientific Instruments sensitive sextant shown in Fig signal slit specimen spherical aberration spherometer star surface telescope temperature transmitted triode tube Universal testing machine usually valve vertical voltage voltmeter wavelength Wheatstone bridge wind wind tunnel wire X-ray