. American telephone practice . FIG. 444.—AMERICAN ELECTRIC FUSE COMPANYS SELF-SOLDERING HEAT COIL. plated and the terminals then soldered in place. The solder usedin this and other heat coils is usually of such alloy as to melt atabout 1600 F. All of the heat coils mentioned are subject to one objection,which, however, has been brought to notice only in view of an in- 610 AMERICAN TELEPHONE PRACTICE. genious improvement recently made. This objection is that whenonce used it was necessary to throw the coil away or to go to someexpense to put it in proper condition to be used again. In Fig. 444
. American telephone practice . FIG. 444.—AMERICAN ELECTRIC FUSE COMPANYS SELF-SOLDERING HEAT COIL. plated and the terminals then soldered in place. The solder usedin this and other heat coils is usually of such alloy as to melt atabout 1600 F. All of the heat coils mentioned are subject to one objection,which, however, has been brought to notice only in view of an in- 610 AMERICAN TELEPHONE PRACTICE. genious improvement recently made. This objection is that whenonce used it was necessary to throw the coil away or to go to someexpense to put it in proper condition to be used again. In Fig. 444 are shown three views of a type of coil embodyingthis improvement. This is manufactured by the American ElectricFuse Company, of Chicago, and was designed by Mr. C. A. Rolfe,of that company. In this, the movable part, instead of entirelyseparating from the body of the coil when the solder melts, is merelymoved from one position to another, and in so moving releases thespring which grounds the line. As soon as the spring has
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