Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 41
ing from B, the wire passes once around thehoop and is led out to B. It then is wound around thehoop nine times more, so that if B and B be connected,the current passes around the hoop once ; if B and B,the current passes through nine turns; while if B and B 28 CURRENT ELECTRICITY. be connected,… … swing. A galvanometer is represented in diagram by thesmall figure on the left. This sign does not representsimply this form of galvanometer, but any form. Precautions.—1. The compass must be in the centreof the hoop. 2. The coil must be in a north and southline. 3. There must be no iron or magnets…
Physics
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