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).
The co-efficient of friction for 'Baraut' and 'Chekko' brake linings.
| Identifier | ExFiles\Box 26\4\ Scan151 | |
| Date | 13th December 1921 | |
| Hv. --- Y3539 ROY.{Sir Henry Royce}4/AG.131221. ---------------- 13th. Decr. 1921. Following our recent conversation re the use of "Baraut" or "Chekko" Brake Linings, and our query regarding co-efficient of friction and method adopted by Makers to determine same, I hand you attached copy of a communication to hand from Messrs. Small & Parkes in connection therewith. I have already handed you data in connection with "Chekko". Roy.{Sir Henry Royce} [Signature] [Stamp: RECEIVED 14 DEC 1921 H8] [Watermark: DICKINSON BOND] | ||