Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 133
that the box is verylong and large and the lenshas a greater focal length. This is an application of the second position of the con-verging lens. The object is placed at 2 F in front, and the plate is placed at 2 F,back of the lens in thebox. (Figure 113.) It is used for takingphotographs of… … Figure 111. — An Astigmatized Eye. Figure 112. — An Astigmatized EyeCorrected. THE MOTION-PICTURE MACHINE 123 An arc light is used to illuminate the object (0, Figure114), which is usually a picture on a glass plate called aslide. In order that more of the light from the arc maystrike the object,…
Physics
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