Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 219
THE LATEST INCANDESCENT LAMP. 173 … Fig. 18. the actual cyclic variation in candle-power, it is necessary, in order to find the limits of practical operation, to make a study of the action of the eye. The ability of the eye to detect flicker has been found to depend upon several conditions, the three most important of which are, —…
Engineering
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