Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 142
tached to the jar, as shown in Fig. 91,and is raised or lowered, with the tip p touching the glass, until aneye on the line Cg, 20 or 30 cm. from the jar, can barely see p> thevery tip of b, apparently in a straight line with Cg. This settingshould be made with care, and after it is made the… … P
Physics
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