Comparative tests of induction wattmeters . -1 i Duncan Induction Wattmeter Type A. Data showing the effect of change of load at normalvoltage and frequency, and 75^ power = voltsTemperature = ° factor = .727Frequency = 60 cycles/sec urrent Watt-hoursmeasured Watt-hoursregistered registered 99 81 66 49 32 25 20 13 7 Duncan Induction V/attmeter Type A. Data showing the effect of change of load at norraalvoltage and frequency

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Comparative tests of induction wattmeters . -1 i Duncan Induction Wattmeter Type A. Data showing the effect of change of load at normalvoltage and frequency, and 75^ power = voltsTemperature = ° factor = .727Frequency = 60 cycles/sec urrent Watt-hoursmeasured Watt-hoursregistered registered 99 81 66 49 32 25 20 13 7 Duncan Induction V/attmeter Type A. Data showing the effect of change of load at norraalvoltage and frequency, and 50^ power = voltsTemperatui-e = ° factor = .491Frequency = 60 cycles/sec. Current Watt-hoursmeasured Watt-hoursregistered registered 66 57 44 53 21 16 13 9 : 4 ?•?^•r--~~r- . ~, I V V ol ? «r?!^ 1 ! ? 1 Dvmcan Induction Wattmeter Type A. Data showing the effect of change of load at normalvoltage and frequency, and unity power = voltsTemperature = 82° factor =.99Frequency = 60 cycles/sec. C\i3?-rent Watt-hoursmeasured V/att-iioursregistered Registered 132 . 109 86 63 42 33 25 16 9

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