The Electromagnet

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Points to be Observed in Practice.
In calculating magnet windings, the utmost care must be exercised in measuring the exact dimensions of the winding volume, otherwise the results will vary greatly.
When it is considered that the resistance varies inversely with the square of the diameter of the wire plus insulation, it is readily seen that these factors are most important. The variation of one-thousandth of an inch in the thickness of the insulation on a No. 35 wire will cause a variation of 2
...3 per cent in the amount of wire that may be wound in a given winding volume.
Also, the diameter of the core to wind on must be taken, i.e., the diameter after the paper or mica or other insulating material has been wrapped around the core, for the thickness of the insulating sleeve, though slight, makes a great difference in the volume of the winding.
The true outside diameter must also be accurately meas- ured for the same reason as with the core, but with the outside diameter the variation is even more marked.


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