Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 266
are for the next set of brushes. In this way30 sets of brushes are accommodated on each side of the bank—60 sets inall. The total number of contacts on both sides is 18,000. THE SYSTEM OF THE WESTERN ELECTRIC COMPANY 243 The nature of this structure is such that great accuracy of alignmentmust be… … Fig. 206.—Sender equipment. entire bank as a unit must also be carefully adjusted in position and main-tained there, because the brushes are on long rods which are controlledfrom the bottom. The set of brushes (Fig. 209) consists of four springs; 37 and 38 arethe brushes for the sleeve or third…
Telephone
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