Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 176
edlethe N-end turns West. This is called the SNOW rule, so called from the firstletters of the important words of the rule. To test this rule arrange things as in Fig. 91. Turnthe cell so that a line through the copper and zincplates will be north and south, and have the copper plateto the south.… … Fig. 91. The S-N-O-W Rule. If the circuit is open, i. e. the dry ends of the platesnot touching, and the connecting wires cut and the endsheld apart, then the N-end of the needle will as usualpoint to the north. Close the circuit by touching the ends of the wire,and the N-end of the compass will…
Electricity
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