Comparative tests of induction wattmeters . Duncan Induction Wattmeter Type A. Data showing the effect of change of load at normalvoltage and frequency, and unity power = voltsTemperature = 62°F,Power factor = .99Frequency = 60 cycles/sec. Current Watt-hoursmeasured Watt-hoursregistered %registered 137 112 95,8 89 65 42 33 3,03 25 16 • 8 > . - - —!!r !Qy ; cc-t- -—^?•-. .ft^o ^ii 1! 3 Id -1 * D .. _ W Duncan Induction Y/attmeter Type A. Data

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Comparative tests of induction wattmeters . Duncan Induction Wattmeter Type A. Data showing the effect of change of load at normalvoltage and frequency, and unity power = voltsTemperature = 62°F,Power factor = .99Frequency = 60 cycles/sec. Current Watt-hoursmeasured Watt-hoursregistered %registered 137 112 95,8 89 65 42 33 3,03 25 16 • 8 > . - - —!!r !Qy ; cc-t- -—^?•-. .ft^o ^ii 1! 3 Id -1 * D .. _ W Duncan Induction Y/attmeter Type A. Data showing the effect of change of load at nonnalfrequency, unity power factor, and lh% normal = voltsTemperature = factor = .99Frequency = 60 cycles/sec. Current Watt-hoursmeasured Watt-hoursregistered el /= iSegistered 102 85 69. 3 QQ 48 32 25 18 12 6

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Keywords: ., bookcentury1900, bookdecade1900, bookidcomparativet, bookyear1907