. American telephone practice . ch form the connecting links betweenthe outside and the inside wiring are often mounted in such acabinet. The idea of constructing switch-board parts in units which maybe removed or placed at will, and by means of which a switch-boardmay be added to without deranging the parts already installed has MAGNETO SWITCH-BOARD FOR SMALL EXCHANGES. 213 been gaining more and more in favor. This idea, however, is per-haps most fully exemplified in the switch-board of the Sterling Elec-tric Company, of Lafayette, Inch, which is shown in Fig. 197. Inthis switchboard the drop
. American telephone practice . ch form the connecting links betweenthe outside and the inside wiring are often mounted in such acabinet. The idea of constructing switch-board parts in units which maybe removed or placed at will, and by means of which a switch-boardmay be added to without deranging the parts already installed has MAGNETO SWITCH-BOARD FOR SMALL EXCHANGES. 213 been gaining more and more in favor. This idea, however, is per-haps most fully exemplified in the switch-board of the Sterling Elec-tric Company, of Lafayette, Inch, which is shown in Fig. 197. Inthis switchboard the drops and jacks are mounted in strips of ten,the strips being vertical instead of horizontal. Each strip of tendrops and jacks also carries with it a portion of the plug shelf, to-gether with a pair of cords and plugs, ringing and listening key,clearing-out drops, and the necessary wiring. One of these unitsmay be removed without disturbing any of the others, and con-versely it will be obvious that in order to increase the board by. FIG. 196.—TWO-POSITTON STROMBERG-CARLSON BOARD WITHTERMINAL CABINET. ten lines at any time, it is only necessary to secure one of these unitsinto the framework, this being accomplished by means of fourmachine screws. With this arrangement the proper proportion ( 10per cent.) of the pairs of cord circuits to the line circuits is alwaysmaintained. In the Sterling board the drops arc not of the self-restoring type,but each strip of ten drops is provided with a rack adapted whenraised to restore any of the drops that are down in that strip. Thisrack is provided with a convenient handle to enable the operator toraise it at the same time that she inserts the plug. In Fig. [98 is shown a type o\ switch-board cabinet sometimes 214 AM ERIC AX TELEPHONE PRACTICE. used in small village exchanges, these cabinets being mounteddirectly on the wall of the room. In order to allow inspection ofthe wiring, such cabinets are usually hinged on their backboards soas to al
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