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).
Testing contact points and comparing the wear of a grey fibre rubbing block with a bakelite block.
| Identifier | WestWitteringFiles\J\February1923\ Scan49 | |
| Date | 29th January 1923 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B. 77 (2) Customer's No. X 2894 X 4357 Jan. 29th 1923. the result of the manner of the deposition of the metal at the contact points. Missing again occurred after about 7,000 miles, (due to the points themselves) but on the whole sparking was fairly good to the end of the test. The points have the same hard pitted, discoloured surface, characteristic of tungsten, although not to such an extent as those tungsten points run on 40/50 ignition. Rubbing Block As when testing the bakelite block, the cam was kept free from lubrication. The maximum wear of the grey fibre block is .008" i.e. from .261" to .253" as compared with .021" i.e. .261" to .240" for the bakelite. With this block however, what little cont'd.{John DeLooze - Company Secretary} Signed This Sheet must be filed on completion of the work. | ||