The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 90
arths magnetism is neutralizedin the apparatus, a much more sensi-tive and effective instrument can beproduced. This is done approximately by theastatic needle, shown in Fig. 31, whichconsists of two parallel needles of equallength attached to a short verticalsupport, with their poles reversed,… … 74 DYNAMIC ELECTRICITY AND MAGNETISM. provided with a graduated scale to indicate tlie amountof deflection. The wire carrying the current passes round one ofthe needles lengthwise, or may pass round each, beingwound alternately in opposite directions; and the polesbeing also reversed, it is evident…
Electricity · Magnetism
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