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).
Test report for an A.T. type speedometer, detailing readings at various temperatures and RPMs.

Identifier  ExFiles\Box 59\2\  Scan003
Date  27th January 1930
  
X 4308
27-1-30
X.4308. A.T. SPEEDOMETER TEST.
Speedometer No. A.677.N800. 14/52 45.0
Speedometer type AT White dial
Other particulars for 10000 miles on 23EX change of reading
Temperature ( °C) | Miles per hour indicated at 600 R.P.M. exactly. | Revs. per mile of drive for correct speed reading.
18.0 | 44.8 | 804
25.0 | 43.6 | 826
30.0 | 42.8 | 841
Miles per hour at 1200 R.P.M.
25.0 | 89.2 | 806
30.0 | 87.4 | 824
3.6.29.
EFC.
  
  


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