Swingle's catechism of steam, gas, and electric engineering ... a complete book of reference for the working engineer in the daily round of his duties (1922)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 111
fig. 512 … FIG. 514 Electricity for Engineers 714. What is electricity? Ans. Electricity is an invisible agent. Its exact na-ture is not very well known, although the laws govern-ing its action, the methods of controlling it, and the ef-fects produced by it are becoming well known. 715. Is it correct to use…
Engineering · Mechanical engineering
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