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).
Inquiring about the consistency of bone grey fibre used for battery ignition contact breaker rubbing blocks.
| Identifier | ExFiles\Box 69\1\ scan0415 | |
| Date | 7th June 1930 | |
| X4646. Roy{Sir Henry Royce}/Ms. from EFC. EFC4/ADL 7.6.30. X.4646. BONE GREY FIBRE FOR BATTERY IGNITION CONTACT BREAKER RUBBING BLOCKS. We are anxious to ascertain that the material used for the rubbing blocks of the battery ignition contact breaker has not varied since December 1926. At that time we were receiving what we called whalebone grey fibre which we proved experimentally to wear particularly well. If there has been any variation we ought now to make comparative tests of the material being supplied. EFC. | ||