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 DrnicBxi Induction 7/attmeter Type showing the effect of change of load at normalfrequency, unity power factor, and 90/^ normal = voltsTemperature = ° factor = .99FrequBncy = 60 cycles/sec. Current Watt-hoursmeasured Vkatt-hcursregistered registered 123 101 81 58 5,0 40 31 24 15 7 .f .i HVP- -ii iiB .?:S ? ^ i a £ . ^^^ °/^ mmcan Induction Wattmeter Type A. Data showing the effect of change of load at normalfrequency, unity power factor, andllO^ normal = voltsTenrperature = ° factor = .99Frequency = 60 cycles/sec. Current Watt-hoursmeasured Watt-hoursregistered registered ISO 123 95 70 46 37 27 18 8

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