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 76
1 the current from south to northover a compass. Close thecircuit by closing the switch(or commutator) and recordthe deflection. (J) Turn the switch so asto reverse the current, caus-ing it to flow from north tosouth over the compass. Record the deflection. Compare these results with what might be…
Physics
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