Bell telephone magazine (1922) (14776176813)

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

Text Appearing Before Image:

ng. Whenit is operating on mud, a large skid isplaced under each wheel in order togive the plow better bearing surfaceto carry the load than is provided bythe 12.75 by 24-inch pneumatic tires.Also, there are large bearing platesunder the framework of the plow. Inaddition to the bearing surface fur-nished by the caterpillar tracks of thecable reel trailers, a large bearing plateextends from the middle of the tongueclear back to the under side of theaxle, as shown in Figure 16. By such expedients as these, theunit bearing pressure on the mud foreach unit of the cable-laying train isso reduced that the train can be slidover the soft surface, while at thesame time depositing the buried cableand wires at the proper distance be-neath the surface (Figure 17). Crossing Streams 1 HE technique followed in crossingsome types of streams is similar inmany respects to that used in negotiat-ing marshy ground. However, if thewater is deep, it may be necessary forthe tractor to detour to shallower wa-

Text Appearing After Image:

aTraaer ^Th ^f> ° ^ ^^^^^^ onto are nuIj/Zfu ,^-^^^^^^010 share and are pulled through and staked before the tram moves ahead Fig. 26. Each succeed-ing cable is clamped tothe end of the cable ahead,in order to pull it intothe plow share

bell telephone magazine 1942 book illustrations telephone bell telephone company american telephone and telegraph company history of technology pneumatics engineering high resolution images from internet archive

1922

Prelinger Library

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public domain