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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).
Request to General Motors for details on their setup for observing valve movement.

Identifier  ExFiles\Box 173\3\  img187
Date  7th May 1934
  
Exptl. Dept.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}18/KW.

7th May, 1934.

Major Hallett,
General Motors Research Laboratory,
Detroit, Michigan,
U.S.A.

Dear Major Hallett,

We are in full song with the silent tappets but still badly need a means of observing exactly what our valve gear is doing.

I should be very grateful if you could let me have any details of your set up for observing valve movement.

Yours sincerely,

FOR ROLLS-ROYCE LIMITED.
  
  


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