Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 321
1 A small hand drill and a small tap with machine screws to correspond should be apart of the equipment of every laboratory. No. 6, 32 is the most convenient size ofmachine screw. 2 For manual training exercise, see Appendix, page 332. 312 PHYSICAL SCIENCE. … Fig. 252. B are made of hard wood. The bar C is a thin piece of softiron attached to the beam with wood screws. The frame D ismade by folding hoop-iron into shape and screwing it to the board. The coil spring E .should be made of fine piano wire. A thin rubber band may be substituted for it. The…
Physics
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