American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 579
L to the local circuit wire /, and through the flat contact strips s* and s^ to ^ mag-nets m^,jm2,m^ and earth. This curient has the effect of attracting the armatures ofthe magnets M^^M^jbut the most important work is performed by m^, which withdrawsthe catch y from arm z. This permits the spring… … AUTOMATIC FIRE ALARM TELEGRAPHY. 469 the cloek-work spring with which its shaft x is geared), in the direction indicated hythe arrow, Fig. 349^. The same action of the cylinder c which released the catch y,holding the break-wheel x, permitted the flat contact springs s^,s2,s^,s* connected withthe…
Telegraph
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