. The practical telephone handbook and guide to the telephonic exchange . Fig. 217.—Scale & MULTIPLE SWITCH-BOARDS—MAGNETO SERIES 193 board may be looked upon as a collection of Standard boards,with the addition of the multiple-jacks and provision forengaged testing. The indicator drops in connection with the local-jacksare arranged at a lower level, in four groups of 50, making 200in all, which is the number of subscribers whose lines are. Fig. 218.—Scaled terminated on each section of this board, and whose calls areanswered by the operators attending on this particular the lo
. The practical telephone handbook and guide to the telephonic exchange . Fig. 217.—Scale & MULTIPLE SWITCH-BOARDS—MAGNETO SERIES 193 board may be looked upon as a collection of Standard boards,with the addition of the multiple-jacks and provision forengaged testing. The indicator drops in connection with the local-jacksare arranged at a lower level, in four groups of 50, making 200in all, which is the number of subscribers whose lines are. Fig. 218.—Scaled terminated on each section of this board, and whose calls areanswered by the operators attending on this particular the local-jacks and the drops a ledge or shelf isformed, through holes in which the connecting cords pass,the plugs attached to them resting when not in use in recessesbored in the shelf, as in the Standard. The cords arearranged in pairs, one in front of the other. Connected to,and in a vertical line beneath each pair, is a ring-off drop,fixed below the calling drops. On another shelf, just below, 194 PRACTICAL TELEPHONE HANDBOOK a listening and ringing key is provided for each of the forty-five pairs of cords. This division of the keys from the corre-sponding cords, etc., is a bad feature which in later switch-boards has been avoided. The cords and accessories arearranged in three groups of about 15 for each of the operatorswho attend. In order to make a complete board, as many sections arejoined together end to end as there are multi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
