Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 163
es, and the arms supporting the adjustable weightsare pivoted to the clamps. The weights may be swung inthe plane of the mirror, and they are made adjustable ontheir supporting arms. The best illumination aside from sunliglit is that of asmall parallel beam from an oxyhydrogen or electric lan-tern.… … SOUND. 141 RE-ENFORCEMENT UF SOUND. The re-enforcement of sounds by the vibration of con-fined masses of air may be readily investigated withoutapparatus, that is, such apparatus as is commonly employedin acoustical experiments. A very simple experiment illus-trating the fact that a sound may be…
Physics · Lantern projection · Electric apparatus and appliances
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