Excerpt from Comparative Tests of Carbon, Metallized Carbon and Tantalum Filament Lamps
Life tests were made of the three kinds of lamps under two different conditions. Ten lamps of each kind were put through the life and efiiciency test upon a steady, well-regulated voltage ... supplied by a storage battery. The battery was kept ¿oating across nearly constant voltage mains and a large rheostat was put in series with the lamps with which to make the finer adjust ments by hand. The maximum variation was probably not more than one volt and the greater portion of the time the voltage was as nearly correct as the portable voltmeter used would indicate. This was designated Condition A and represents the best con ditions under which the lamps would ever be operated in practice. The same number of lamps were operated under adverse condi tions. A badly ¿uctuating alternating current was supplied to the lamps and there was considerable vibration. This condition, designated Condition B, is representative of very bad operating conditions. Fig. 15 to 20 Show the candle power performance of each lamp in the test. The uniformity of the lamps under con d-ition A is noticeable, none of the curves varying greatly from the mean.
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