. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . 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. Fig. 207.—Selector frame.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19