File:Bell telephone magazine (1922) (14755987372).jpg

Identifier: belltelephonevol21mag00amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
Fig. 19, left: A multi-drum winchon a tractor. It is used for ad-justing the depth of the plow,loading cable reels, and movingtrailers. Fig. 20, above: Thisrelay winch pulls the tongue endof the rear trailer into a specialkeeper which serves as a coupling.Paying out the wire rope permitsthe trailer to drop behind Fig. 21, right: Release of therelay winch has halted therear trailer. The bullet-noseconnector is shown at the endof the trailer tongue, at thelower right. Fig. 22, below:This keeper, under the axleof the front trailer, receives thebullet-nose connector, whichis held by tension on the ropefrom the tractor ahead
Text Appearing After Image:
Plowing Cables into the Ground 99 a second buried cable. A passagewayat least 10 feet wide is cleared, and atreel change points additional width isrequired to maneuver the equipment.The 10-foot width will permit passageof the train in rooting and plowing.However, unless the cost of clearingan extra three feet of right-of-way isexcessive, it is very desirable to havea 13-foot passageway so that the 8^-foot-wide tractor can be used fortamping, as will be discussed later.Where practicable, the trees withinthe proposed plow-trench area arepulled out by the roots in order toeliminate the interference with plow-ing which the roots would cause, andalso in order that the roots may notconduct lightning to the cable. Crossing Swamps It has been necessary in a few casesto bury cable across marshy groundor swamps (Figure 13). This haspresented a difficult problem. How-ever, because of the use of speciallydesigned equipment and appropriatemethods, there have been no caseswhere the heavy cable-plow

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