. 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
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