File:Electrical instruments and telephones of the U.S. Signal corps (1911) (14753389501).jpg

Identifier: electricalinstru00unitrich (find matches)
Title: Electrical instruments and telephones of the U.S. Signal corps
Year: 1911 (1910s)
Authors: United States. Army. Signal Corps
Subjects: Military telegraph -- United States Military telephone -- United States
Publisher: Washington, Govt. print. off.
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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be boundtightly around the exposed edges of the cable covering. The opera-tion of binding the cable at this point is known as butting anilshould ))ro- LOCt\ MITCH.CA&Lt CLAMP ceed as shownin figurei.or>/>. T h e taiie is tirstlooped, andthen its long-end is wounda r o u n d thecable four orfive times andt h r e a d c dthrough the looj^ which was first foruKMl. T\\q end .1 is then drawn under theturns by ))ulling the end // and closing the loop. Next, the looseends are cut away and a coating of shellac is applied, completing thebutt. The exposed twisted pairs of the standard switchboard cableshould now be put in boiling yellow beeswax up to the butt until allthe bubbles disapjiear froui tiic licjuid. The purpose of this Avax isto expel all moisture and imi)r<)\ e the insulation of the wires, and alsoto prevent the braid loosening up while the form is being completed.All surplus wax should be gently beaten from the cable with a stickwhen it is removed from the boiling pnu.
Text Appearing After Image:
mm- WlRtMlli TWISTCD PWR5 - CONDUCTORS Fk;. 10. ELECTRICAL INSTRUMENTS L. S. SIGNAL CORPS. 169 -^^

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