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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).
The calibration of A.T. speedometers for the 40/50 HP chassis.

Identifier  ExFiles\Box 50\4\  Scan161
Date  22th December 1927
  
EFC. {E. Fowler Clarke - Electrical Engineer} X4308

BY {R.W. Bailey - Chief Engineer} /Cgh {W Clough} 7/G.22.12.27.

A.T. SPEEDOMETERS FOR 40/50 HP. CHASSIS.

In reply to EFC {E. Fowler Clarke - Electrical Engineer} 7/T.16.12.27. the speedometers as fitted to present production Phantom chassis with 33" x 6.75" low pressure tyres and 15/52 ratio rear axles are calibrated to 730 revs. per mile, therefore these instruments should read 49.25 miles per hour at 600 r.p.m.

BY {R.W. Bailey - Chief Engineer} /Cgh. {W Clough}
[Signature]

[Stamp: RECEIVED 23 DEC 1927]
  
  


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