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 44
raph Keys. The general type of telegraph key used todaywas originally designed by Alfred Vail about LS40. The modernkey is, however, greatly improved in details, as is shown in Fig. 9.The operation of keys of this type requires an up-and-down move-ment of the hand involving certain muscles which… … Standard MorseTelegraph KeyCourtesy of Postal Telegraph-Cable Company 33 24 MODERN LAND AND SUBMARINE TELEGRAPHY Several forms of a new type of key designed to relieve this strainhave been put on the market and are now quite extensively used.One key of this semi-automatic type, shown in Fi<j;.…
Electrical engineering
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