[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 162
The early manner of holding this core was bymeans of two taper plugs of wood forced into the in-side by nuts on the shaft. See Fig. 5. This injuresthe insulation and prevents the ventilation of thewire. Besides, it is difficult to wind the wireevenly enough on the inside of the ring to makethe… … into which slip arms of two spiders. See Figs.9 and 10. These are of brass and firmly keyed tothe shaft. Stiff wrought-iron rings at the ends ofthe armature core receive the pressure of the spidersand hold the sheets firmly together. The wire isthreaded in and out as in the other case, to make…
Electricity
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