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Department of Commerce
Measurement of lamps for character1st1c relat1ons
Compar1son of computed and observed values
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accuracy actual wpc ampere calibration Candles Deviation cent candles cent cp cent volts cent watts CHARACTERISTIC EQUATIONS chosen as normal color match color screens color vision Comparison of Computed Computed and Observed computed cp corresponding values Cp Dif determined different color Elec equa equation 1a equation expressing example exponent family of curves filament fundamental equations Hence incandescent lamps log cp match with 4-wpc mean method National Physical Laboratory normal candlepower normal efficiency normal values normal wpc observed from computed observed values observed wpc pentane percentage factors photometric photometric measurements primary standards reduction respectively slide rule Table 19 Tables 20 tabulated values test lamps tion tungsten lamp tungsten standards tungsten working standards values corresponding values for normal values of candlepower values of voltage values of wpc variables voltage and candlepower voltage ratio voltage-wattage voltages corresponding Volts Ampere Volts Dif wattage Watts Dif wpc basis Wpc Volts