. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 204.—Line finder frame. Fig. 205.—Rotary switch for sender selector. one trunk line or subscriber line (tip, ring, and sleeve). One hundredsets of strips (300 strips) are built up into one bank. The arrangement issuch that the lugs may be aligned vertically in rows, and groups of the extreme left may be seen three vertical rows of lugs or are the row over which one set of brushes move. The next throevertical rows of contacts are for the next set of brushes. In this way30 sets of
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . Fig. 204.—Line finder frame. Fig. 205.—Rotary switch for sender selector. one trunk line or subscriber line (tip, ring, and sleeve). One hundredsets of strips (300 strips) are built up into one bank. The arrangement issuch that the lugs may be aligned vertically in rows, and groups of the extreme left may be seen three vertical rows of lugs or are the row over which one set of brushes move. The next throevertical rows of contacts 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 obtained and maintained. The bank must be flat and the sidesof the contact lugs ground to a straight line, because the brushes makecontact with the edges of the contacts instead of their flat sides. The. 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 wire; 36 and 39 are the line brushes. 244 AUTOMATIC TELEPHONY
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
