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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 Cadillac Motor Car Company discussing cast iron brake drums and providing a preferred material specification.

Identifier  ExFiles\Box 170\2\  img032
Date  3rd April 1931
  
Handwritten note:
Hs{Lord Ernest Hives - Chair}/Row many thanks. The C.I. seems to be the Bramitec as you say.
By the way I notice you have written a number of notes on the back of 2nd page on radiators. I mention it in case you have lost them. Bg

Printed text:
CADILLAC AND LASALLE MOTOR CARS

CADILLAC MOTOR CAR COMPANY
DETROIT, MICHIGAN

April 3, 1931.

Mr. E.{Mr Elliott - Chief Engineer} W. Hives,
Rolls Royce, Limited,
Derby, England.

Dear Hives:

Re. Cast Iron Brake Drums

Replying to Hs{Lord Ernest Hives - Chair}/G.W.H./ of April 1, 1931.

(1) Am sending under separate cover a small sample of C.I. brake drum which may be useful.

(2) Have discussed with our laboratory, the specification which Mr. Hancock sent. Criticism of this is:

(a) Total carbon too high.
Combined carbon O.K.

(b) Silicon O.K.

(c) Phosphorus too high.

(d) Not enough total alloy to get required physicals.

(3) Preferred specification is:

Total carbon - 2.20
Combined carbon - .60
Silicon - 2.2 - 2.6 (wide variations permissible.)
Phosphorus - Max. .20
Manganese - .30 - .50
Molybdenum - .50 -

Tensile - 50,000 lbs. per sq. inch.

Transverse break 1 1/4" dia. cast bar 12" centers 5000 - 7000 lbs.

Modulus of elasticity - about 15 million.

(4) A white iron is used as a base and remelted in the electric furnace with addition of final graphite and silicon, I understand in the ladle.
  
  


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