Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 380
Mayers Floating Needles, Prof. A. M. Mayer has devised an arrangement of float-ing magnetic needles which beautifully exhibits the mutual 358 EXPERIMENTAL SCIENCE. repulsion of similarly magnetized bodies. A number ofstrongl_v magnetized carpet needles are inserted in smallcorks, as shown in Fig.…
Physics · Lantern projection · Electric apparatus and appliances
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