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 material specification and testing of Tommy Bars.
| Identifier | ExFiles\Box 20\8\ Scan057 | |
| Date | 15th December 1924 | |
| Mr. Booth. c. Hs.{Lord Ernest Hives - Chair} X1027 BY22/H.{Arthur M. Hanbury - Head Complaints} 15. 12. 24. TOOLS. TOMMY BARS. Would you kindly arrange in future that our Tommy Bars are produced from 3½% Nickel Steel of a hardness of 286 to 321. Will Hs.{Lord Ernest Hives - Chair} kindly have a number of Tommy Bars made to the above Brinell and test same in regard to strength of the bar itself when used in conjunction with our box spanners. BY.{R.W. Bailey - Chief Engineer} | ||