Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 232
means of an induction coil,the voice current upon the supply terminals of the oscillatory portionof the arrangement. A direct-current dynamo of 440-volt pressureis used. The transmitting aerial is inductively coupled to the closedoscillation circuit. Many different forms of arc have been… … WIRELESS TELEPHONY 21 connected with the aerial and its associated capacity and inductance.By using fairly low antennae, the Ruhnier system has operated verysuccessfully over comparatively short distances. Poulsen Si/siem. Special interest attaches to the Poulsen systemby reason of the fact that…
Electrical engineering
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