. American telephone practice . \x FIGS. 430 AND 431.—POSTAL AND WESTERN UNION TYPES OFCARBON AND FUSE ARRESTERS. so that its ends may be accessible for soldering. The fuse is madein this general form for two reasons, one of which is to give asubstantial case in which the comparatively delicate fuse may be 602 AMERICAN TELEPHONE PRACTICE. held safe from mechanical injury. The second reason is that ex-periment has shown that the incasing of a fuse in a tube, whether itis hermetically sealed or not, tends to prevent the arcing of a heavycurrent across the terminals after the fuse has blown. In c
. American telephone practice . \x FIGS. 430 AND 431.—POSTAL AND WESTERN UNION TYPES OFCARBON AND FUSE ARRESTERS. so that its ends may be accessible for soldering. The fuse is madein this general form for two reasons, one of which is to give asubstantial case in which the comparatively delicate fuse may be 602 AMERICAN TELEPHONE PRACTICE. held safe from mechanical injury. The second reason is that ex-periment has shown that the incasing of a fuse in a tube, whether itis hermetically sealed or not, tends to prevent the arcing of a heavycurrent across the terminals after the fuse has blown. In case thefuse is hermetically sealed, the forming of gas prevents the arc frombeing maintained, and sometimes the casing explodes as a there is an opening in the casing, the expansion within due to. FIG. AND CARBON ARRESTER AS APPLIED TO MAGNETO TELEPHONE heat and gas that is formed, tends in passing through the opening,to blow whatever arc is formed. The method of clamping the wire at each end of the fuse, shownin Fig. 433, is obvious, one end of the line wire being clamped be-tween the parallel jaws at the right hand end of the cut, and theother end between the brass terminal block and the inside nut atthe left hand end of the cut In each case the outside nut serves asa lock nut. This particular fuse is one made by the AmericanElectric Fuse Company, of Chicago. It is particularly adaptableto clamping directly on the line wire outside of the subscriberspremises as at the point, E, in Fig. 427, the parallel jaws serving togrip the line wire usually at or near the insulator, while the wire PROTECTIVE DEVICES. 603 leading to the subscribers premises is clamped by the nuts at theother end. When used on a cable pole, as for instance at the point, D, in , these fuses
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