Light, photometry and illumination : a thoroughly rev. ed. of ''Electrical illuminating engineering'' (1912)
Barrows, William Edward, 1878-1960 · New York ; London : McGraw-Hill Book Co. · leaf 155
rangement of the rotating-mirror apparatus is shownin Fig. 77.^ For experimental purposes it was so constructed thatthe lamp could be rotated independently of the mirrors. Themirrors may be rotated by a motor belted to pulley E. Themirrors are held to the frame by the bolts B and the frameprevented… … Fig. 78.—Mirror reflector photometer. must be burned in a certain position, as for instance an arclamp which cannot be inclined without introducing variationsin its candle-power values, it becomes necessary to resort toother means than those heretofore described. A device for this purpose…
Light · Photometry · Electric lighting
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