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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).
Laboratory report on the chemical analysis of a failed Hessbright Bearing from an American Planet Wheel.

Identifier  ExFiles\Box 38\1\  Scan016
Date  23th January 1919
  
R.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13.
X. 3403.
H15/B23119.
Mr Clark.
January 23rd, 1919.
Laboratory.

From our Laboratory Fortnightly Report for December 7th, 1918, the following paragraph is given below re Hessbright Bearing:-

"Some balls from a Hessbright Bearing from American Planet Wheel, that failed under engine test gave the analysis:--

Carbon 1.2
Manganese .56
Phosphorus .025
Chromium .53

From this analysis it appears that the carbon and manganese are on the high side and the chromium is low according to our specification, and this has tended to make the balls fail, probably owing to excessive cementite.

Jrdd
  
  


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