Augsburg, De Resco Leo, b. 1859 · Boston, New York, Educational Pub. Co · leaf 146
l^iluJ … Oaul Hold the prism in the position of Fig. 5, then in the positionof Fig. 6, Fig. 7, Fig. 8, and Fig. 9, and observe: (1) Thatwhen the top is on a level with the eye, it is a horizontal line.Fig. 5. (2) That when the top is below the level of the eye,it can be seen, and the farther it is below the…
Drawing
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