[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 161
out through the inside. See Figs. 6 and 7. At first a solid piece of iron was used to formthe core, but, as in other cases, sheet iron is nowexclusively used. A good proportion for cylinder armatures is forthe diameter to be two-thirds the length. In the ringform the diameter should be about twice… … 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…
Electricity
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