Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 281
ed electromagneticwaves in the ether by an apparatus, a diagram of which, is shown in fig. 126The apparatusconsists of an in-duction coil A,to which a cur-rent is suppliedby a powerfulbattery, B, in amanner similiarto that shown in dealing with Ruhmkorffs induction coils(see § 82). The secondary… … ELECTRICAL ENGINEERING 279 adjusted as to slide on rods E and F, respectively. Theair space M, called the air gap, between the balls G andH, may be enlarged or diminished by moving the rods Band F. The resonator N, consists of either a wire rectangle orcircle which terminates in two small brass…
Electrical engineering
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