Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 654
an erecting prism is required. The discovery of the action of an electric current upona magnetic needle was made by Christian Oersted in 1819.It is shown by experiment that the magnetic needle tendsto arrange itself at right angles to a conductor carr3-ing acurrent. In Fig. 610 is illustrated a… … Electrical Repulsion. 63: EXPERIMENTAL SCIENCE. The needle turns on a pivot projecting from a little platecemented to the center of the glass. When a conductor islaid across the compass, parallel with the needle, and a cur-rent is sent through the conductor, the needle is deflectedin one direction…
Physics · Lantern projection · Electric apparatus and appliances
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