A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 77
rection of the current note the direction of thedeflection. (c?) Pass the current froni the cell over the compass fromsouth to north, holding the wire close to the face of the com-pass and make the return wire pass under the compass sothat a loop is made around the compass. Is the deflectiongreater… … 62 LABOEATOBY MANUAL What change in the deflection is produced by increasing thenumber of turns in the coil ? (6) Make a helix (Fig. 36) by wrapping the wire sayfifty times around a lead pencil. Connect this to the switch or commutator as in I,and see whether or notsuch a helix carrying acurrent…
Physics
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