Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 77
er its sides and hold it flat on its backwhen it is lying upon the table. The rectangular block (No. 9).The measuring-stick (No. 3). A sheet of paper. Thread. Take two pieces of strong thread, one about 12 inches, the otherabout 6 inches, long, and tie one end of the short thread to the middleof… … Fig. 41.ance, taking care that the slit of each balance-face is in a straight linewith the thread, until no one of these reads less than 3 oz. THE PARALLELOGRAM OF FORGES. 65 It will be found that any variation in the angles which the stringsmake with each other will require a change in the forces.…
Physics
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