File:Bell telephone magazine (1922) (14569786279).jpg

Identifier: belltelephonemag11amerrich (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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S ta fe A NEW WAY OF SPLITTING SECONDS revolution per hour with sixty divisions. Thus minutes, sec-onds and one hundredth seconds can be conveniently read. Figure 1 shows a photograph of the 200 cycle generator usedin this model and Figure 2 shows an assembly view of thecamera, clock and a control box designed to provide the neces-sary power. The whole system is operated from alternatingcurrent of 110 volts. The optical system provided to photo-graph the clock dials can be seen at the left rear end of themain camera lens assembly. This system was first tried out at the Columbia-Syracusetrack meet at Baker Field, New York, on May 14, 1932. Fig-ure 3 shows the first race to have been timed with this system.It was the 100 yard dash in which the time as shown to thenearest hundredth of a second was 10.26 seconds. At thePrinceton-Cornell meet at Princeton on May 21, 1932, thesystem was successfully demonstrated and on June 19, 1932the apparatus was sent on the Intercollegiate special train

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