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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).
Letter from A. Schrader's Son Inc. regarding the merits of screwed tyre valve connections over slip-on rubber types.

Identifier  ExFiles\Box 136\3\  scan0155
Date  20th November 1922
  
Copy of Letter.
----------------

From A.SCHRADER SON Inc.

Victoria Road,
Willesden
LONDON N.W.10

November 20th.1922

Messrs. Rolls-Royce Ltd.
Nightingale Road.
DERBY

ROY{Sir Henry Royce}12/MG17.11.22

Dear Sirs:-

Your letter of the 17th instant to hand.

We do not manufacture any Pump Connections of the slip-on-rubber pattern, although we appreciate the popularity of this type of fitment, but so far as our No.2815 Connection is concerned it would not be practicable to alter the design, inasmuch as rubber would not provide a sufficiently definite location to ensure that the projecting pin of the Connection impinged directly on the small Plunger Pin of the Valve "Inside", and also it would not be possible to govern the opening of Valve Seating when a Pressure Gauge was applied.

While a screwed Connection would take longer to apply than the slip-on type, the absolute air holding qualities of the "Schrader Universal" Tyre Valve greatly reduce the need for so frequent Tyre Inflation as was the case when the old type of Valve was used, and we respectfully suggest the advantages of the No. 2815 Connection more than counterbalance the slightly increased time required to make a joint with this fitment.

Yours faithfully,

A.SCHRADER'S SON INC.,

Service Department.

[STAMP]
RECEIVED
NOV 23 1922
HS{Lord Ernest Hives - Chair}
  
  


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