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 of an AT Speedometer after 10,000 miles, noting reading inaccuracies and a failed trip counter.

Identifier  ExFiles\Box 59\2\  Scan101
Date  3rd February 1931
  
E.J.C.
X6051b.
3-2-31
J.D.113.
X6051
Test of AT Speedometer D231 740 "/50
off 18 GIX after 10000 miles
This speedometer has been tested & is reading 0.5 M.P.H. lower than previously & has a percentage fall of reading of 2.4 as against 2.1 previously.
The trip counter failed to register whilst running on the rig.
g.j.
  
  


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