Wright, Mark R., 1854- · London : Longmans · leaf 234
ositedirection. By noting the combination of right and left swings, theoperator reads the message. (See alphabet fig. 226.) The Single Needle Instrument—A front view of the in-strument is given ; the tappers are seen in elevation (fig. 226).The steel indicator on the dial is parallel to, and moves… … the earth; the copper pole is joined to a free wire. Keys, d dpermanently connected with the telegraph line, can be joinedat will, either with the instruments or with the free copper ter-minals ; when no message passes they are connected with the Q 226 Voltaic Electricity instrument as at d. In…
Physics
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