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AN AUTOMATIC RACE TIMER

 

作者: Edwin A. Speakman,  

 

期刊: Review of Scientific Instruments  （AIP Available online 1931）
卷期: Volume 2, issue 5  

页码: 297-304

 

ISSN:0034-6748

 

年代: 1931

 

DOI:10.1063/1.1748792

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The instrument described is used to time races by the use of a microphone, a photoelectric cell, an amplifier, and a clock. The time is recorded in 1/120 of a second from the instant when the sound of the starting gun reaches the runner's ear to the instant when the runner's chest touches the tape at the finish.

 

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