Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 48
eci-sion. It is well to make ones self acquainted with severalof the more important of these instruments. b The spring compass, used in every drawing-room, issimply a means of transferring a measurement, with greataccuracy, from line to scale, or scale to line. Yet even sosimple an instrument is…
Physics
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