Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Check of revolutions per mile for a speedometer.

Identifier  ExFiles\Box 59\2\  Scan027
Date  16th May 1930
  
X4308.
CHECK OF REVOLUTIONS PER MILE OF SPEEDOMETER.
Speedometer :- No D999. 720. 1/50
20 HP Taken from stock
Date :- 16-5-30
Mile reading | Counter reading.
Observed at finish. | 00461 | 29066
Observed at start. | 00374 | 13409
Difference | 87 | 15657
Counter revs. per mile | 180
Instrument revs. per mile. | 720
28.10.29.
  
  


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