. Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] . FIG. 1.—SMALL MAGNETO SWITCHBOARD. FIG. 2.—REAR VIEW OF MAGNETO EARLV TELEPHONE EXCHANGE IN NEW YORK CITY. CENTRAL OFFICE OR EXCHANGE. 47 function is to draw the cord back to its place as soonas the operator has removed it from the jack and thuskeep the cord shelf free. A rear view, showing theapparatus contained, is given in Fig. 2 on platefacing page 46. An operator can usually attend to about one hundredlines, and magneto boards are as a rule built in sec-tions accommodating thi
. Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] . FIG. 1.—SMALL MAGNETO SWITCHBOARD. FIG. 2.—REAR VIEW OF MAGNETO EARLV TELEPHONE EXCHANGE IN NEW YORK CITY. CENTRAL OFFICE OR EXCHANGE. 47 function is to draw the cord back to its place as soonas the operator has removed it from the jack and thuskeep the cord shelf free. A rear view, showing theapparatus contained, is given in Fig. 2 on platefacing page 46. An operator can usually attend to about one hundredlines, and magneto boards are as a rule built in sec-tions accommodating this number. As the numberof subscribers increases, succeeding sections may beset up in proximity to each other, and, so long as theexchange is limited to three operators, each can reachthe jacks of all subscribers, and hence can connectwith all. When more than three operators are needed,it is impracticable for each operator to reach all thejacks. There are two solutions: One, the so-called trans-fer system, in which, if a subscriber calls for a partywhose jack is out of the operators reach, she maytransfer the call to some other operator before whom thejack of the desired
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
