. American telephone practice . FIG. 438.—KELLOGG CARBON ARRESTER FOR TELEPHONE SETS. arrester strip, heat coils and carbons. The heat coil in the left handportion of this figure is shown in proper relation to its springs,as in normal use. That at the right hand portion, however, showsthe heat coil after it has been operated, thus allowing the springsto separate, opening the line circuit and closing it to ground. The 606 AMERICAN TELEPHONE PRACTICE. circuit through these arresters may be traced by following thearrows marked a and b, these arrows leading from the wires ex-tending to the switch-
. American telephone practice . FIG. 438.—KELLOGG CARBON ARRESTER FOR TELEPHONE SETS. arrester strip, heat coils and carbons. The heat coil in the left handportion of this figure is shown in proper relation to its springs,as in normal use. That at the right hand portion, however, showsthe heat coil after it has been operated, thus allowing the springsto separate, opening the line circuit and closing it to ground. The 606 AMERICAN TELEPHONE PRACTICE. circuit through these arresters may be traced by following thearrows marked a and b, these arrows leading from the wires ex-tending to the switch-board to the wires extending to the outsideline. Following arrow a, it will be seen that the circuit extends from. GROUP FIG. 439.—CONNECTIONS OF KELLOGG CARBON ARRESTER. the spring connecting with the removable head of the coil, thence,when the coil is intact, through the winding of the coil and throughthe spring which holds the other end of the coil through which thecircuit is led, to one of the left hand terminals of the arrester,through the insulated tube of brass surrounding the bolt which holdsthe entire structure together. Ordinarily this circuit is entirely in-sulated from all other portions of the arrester, but when the heatcoil is traversed by too great a current, it is pulled apart by springs,
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
