File:Bell telephone magazine (1922) (14569544177).jpg

Identifier: bellvol25telephonemag00amerrich (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
chnicalService Command requested the Lab-oratories to study the possibilities oflaying telephone wire from the air—and to do it on a rush basis. It wasspecified that standard Army fieldwire be used, a flying speed of 150miles per hour was designated, andthe maximum length of wire to belaid in a single flight was put at 15miles. An outdoor laboratory was set upat Murray Hill, N. J., including a 40- 1946 Bell Laboratories Role in Victory 41 foot tower near the top of which ex-.perlmental packs of wire might beplaced. In a building several hundredfeet away, a motor-driven drum waslocated by means of which wire couldbe drawn at speeds up to 200 milesper hour from the coils or packs inwhich it was wound. At this labora- Air Base and assigning to it a Labor-atories flight testing team. A totalof well over 200 test flights weremade—in which the performance ofthe various types of coils and packs,as well as inter-coil splicing methods,were thoroughly studied. In the standardized system two
Text Appearing After Image:
Sixteen miles of field wire are coiled within the boxes fastened securely in thisplane, the outside end of each coil spliced to the inside end of the next coil tory the performance of various typesof coils and packs was studied withthe aid of high-speed cameras andelectrical devices. Flight testing was also speeded byestablishing a field laboratory in abuilding provided by the Air Tech-nical Service Command at Fort Dix wires, twisted together as manufac-tured, are wound on a specially de-signed machine into criss-cross oruniversal coils, similar in form tothe balls of lacing twine used by thetelephone installer. Each coil con-tains one or two miles of wire, de-pending upon the type, and each is 42 Bell Telephone Magazine SPRING encased in a square wooden box with ahole in each side about one-half theoutside diameter of the coil. When a mission is to be flown, thenumber of boxes required are loadedinto a C-47 plane, lined up in echelonfrom the open doorway to the for-ward end of the ca

Note About Images