# Page:Popular Science Monthly Volume 65.djvu/19

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15
A NEW METHOD OF RESEARCH.

After passing through the prisms, the light, which has now been deflected through an angle of 180°, falls upon a second large lens at the

Fig. 7.—Minute Structure of the Calcium Flocculi at H2 Level. 1903, September 22. (Scale: Sun's Diameter ${\displaystyle =}$ 0.890 Meter.)

lower end of the camera tube. This forms an image of the spectrum at the upper end of the tube, where the second slit is placed. Any line in