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Stanley-Thompson (44 volts)
28
S T A N L E Y - T H O M P S O N (44 These lamps test, but varied tially the same light at the top a lot of fifty.
VOLTS).
gave the highest average efficiency of any lot under considerably from each other. The curves are essenas those of the 96 volt lamps, except in giving less of the lamp. The lamps were taken at random from
W O O D H O U S E AND R A W S O N L A M P S . Two lots of these lamps were tested. The results obtained were generally the same. The first'lot were marked 55 volts, and were taken from twenty-five lamps furnished. The slight irregularities in the curves (Fig. 10) are due to the fact that the lamp was mounted on a spring socket (Swan) in the efficiency measurements, and the motion and vibration of this socket in moving it through the various positions occupied, prevented as accurate measurements as in other cases, where the lamp was held rigidly. The second set of Woodhouse and Rawson lamps, selected from fifty furnished, were marked 50 volts, and a paper accompanying them from the makers, invoiced them as " 20 candle-power, 50 v o l t " lamps. They were tested by the committee, as the duration test on the former lot was unsatisfactory by reason of many of the lamps being connected two in series. On setting the new lot up at 50 volts, they were found to give only twelve spherical candles, and to have an efficiency of about five watts per candle. The Woodhouse and Rawson is known as a very economical lamp, and has of late attracted much interest on that account. A duration test of 300 hours was all that could be allotted to these lamps and would determine nothing if tile lamps were tested at so low candle power. As the resistance of the lamps cold was the same as some of the first lot of 55 volts, the committee determined to test the second lot at that potential also, with a statement of the facts.
S T A N L E Y - T H O M P S O N (44 These lamps test, but varied tially the same light at the top a lot of fifty.
VOLTS).
gave the highest average efficiency of any lot under considerably from each other. The curves are essenas those of the 96 volt lamps, except in giving less of the lamp. The lamps were taken at random from
W O O D H O U S E AND R A W S O N L A M P S . Two lots of these lamps were tested. The results obtained were generally the same. The first'lot were marked 55 volts, and were taken from twenty-five lamps furnished. The slight irregularities in the curves (Fig. 10) are due to the fact that the lamp was mounted on a spring socket (Swan) in the efficiency measurements, and the motion and vibration of this socket in moving it through the various positions occupied, prevented as accurate measurements as in other cases, where the lamp was held rigidly. The second set of Woodhouse and Rawson lamps, selected from fifty furnished, were marked 50 volts, and a paper accompanying them from the makers, invoiced them as " 20 candle-power, 50 v o l t " lamps. They were tested by the committee, as the duration test on the former lot was unsatisfactory by reason of many of the lamps being connected two in series. On setting the new lot up at 50 volts, they were found to give only twelve spherical candles, and to have an efficiency of about five watts per candle. The Woodhouse and Rawson is known as a very economical lamp, and has of late attracted much interest on that account. A duration test of 300 hours was all that could be allotted to these lamps and would determine nothing if tile lamps were tested at so low candle power. As the resistance of the lamps cold was the same as some of the first lot of 55 volts, the committee determined to test the second lot at that potential also, with a statement of the facts.