Luckiesh, Matthew, 1883- · New York, D. Van Nostrand company · leaf 107
90 COLOR AND ITS APPLICATIONS less than 8 inches long, is mounted on a tripod, and is really portable. There are many designs of spectrophotometers, but all have the same object. It is necessary to be able to vary the luminous intensity of one-half of the photometer field. This is done by varying… … Fig. 44. — The variable sectored disk. front of the slit S, by (After Hyde.) means of a micrometer screw. The transmission is nearly proportional to the lateral displacement. By means of the spectrophotometer, results can be obtained directly in terms of relative energy such as are plotted in Fig.…
Color
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