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 286
tion. When it is desired that the receiving station register onlythe waves coming from a certain direction, then the coherer is placed in the focus ofa parabolic mirror whichfaces the direction. Thearrangement is the sameas in fig. 133, the oscil-lator being replaced bythe coherer. Reflectorsmay… … OSGILCATOR
Electrical engineering
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