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 receipt of various Hoffman ball bearings for an Indicator Diagram Apparatus.
| Identifier | ExFiles\Box 79\3\ scan0031 | |
| Date | 10th July 1918 | |
| X2981. Mr. Coverley from EFC. Indicator Diagram Apparatus EFC/AT10.7.18. Please note we have received the following parts which may be had on application at the stores. X.3180. 1S7 small type ball brg. Hoffman X.2981. 2 L.S. 8 light " " " 2 S.3 small " " " 2 M.S. 3 medium " " " EFC. | ||