Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 51
his experiment is toverify the principle of parallelogram of forces ; thatis, to compound sets of forces in accordance with thisprinciple, and find whether the force thus determinedis the true resultant. Apparatus. — The arrangement is shown in thediagram. Three spring balances are used, to… … Fig. 7. — Apparatus arranged for experimenting with concurrent forces MECHANICS OF SOLIDS 23 cords are secured at any desired points at the edgesof the table by clamp hooks provided with thumbnuts. Operations. — (a) Let each of three students pullsteadily on a balance and secure it to a clamp…
Physics
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