Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 82
lowing method will avoidsuch errors: Take a piece of stiff paper about 1J X 4 inches, beingsure that the upper edge is clean and straight. Wrapitaround the cylinder, and allow a portion to project, asshown in Fig. 48. Grasp the projecting portion with thefinger and thumb, taking care that the upper… … touches it; Fig. 49. In this position the sight is horizontal.If the upper edge of the paper is just on a line of thescale, this gives the reading; but if not, the fraction mustbe estimated by the eye and expressed as a decimal. Sup-pose it comes, as in Fig. 50, between the 17 and 18 line.…
Physics
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