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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 Zenith Carburetter Co Ltd concerning two modified DC-42 carburetters sent for testing.

Identifier  ExFiles\Box 122\3\  scan0025
Date  1st June 1938
  
The ZENITH CARBURETTER·CO·LTD

HONEYPOT LANE, STANMORE, MIDDLESEX
ADJOINING QUEENSBURY UNDERGROUND STATION

CARS DRIVEN BY OUR STAFF ARE AT CUSTOMERS OWN RISK AND RESPONSIBILITY.

TELEGRAMS:
ZENICARBUR, PHONE, LONDON.
CODE A.B.C. 5TH EDITION.

ALSO AT
LYONS, PARIS,
DETROIT, TURIN,
BERLIN.

TELEPHONE:
WORDSWORTH 2213

1st June 1938

[Handwritten Note]
G.R. Arrange for these two to be tested & report Rm.{William Robotham - Chief Engineer}

Messrs. Rolls-Royce Ltd.,
DERBY.

Attention: Mr. Rowbotham

Dear Sirs,

We have despatched today marked for the attention of Mr. Rowbotham, 2 x DC-42 carburetters.

One of these carburetters has strangler mechanism of the standard design as regards operation, but it is fitted with a strangler plate which is 2 m/m thick.

The strangler mechanism of the second carburetter has been modified in such a way that should a blow back occur then the strangler flap will open in the opposite direction and so relieve that blow back.

These two propositions are put before you in view of your request to our Mr. Fisher that some efforts should be made to remove the disadvantage you have found in one or two cases of the strangler plate sticking in the closed position.

Of the two we much prefer the thicker strangler plate. We do not think that such a plate could bend, and

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