Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 140
ard candle or toanother light of which thecandle power is known. Tomake this comparison thephotometer is used. The photometer is a pieceof paper with a grease spot onit. This paper may be eitherplaced in a small black box ;(Figure 120), or may be putin a standard which holds itin position. To… … Figure 120. — Cross Section ofBunsen Photometer. 130 ILLUMINATION AND CANDLE POWER disappear, or look the same shade on both sides, when thecorrect position is reached. By measuring the distance (dx) of the unknown light (X)to the photometer, and the distance (d8) from the known
Physics
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