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).
Test log for battery ignition rubbing blocks, detailing material, wear, and conditions.
| Identifier | ExFiles\Box 69\1\ scan0383 | |
| Date | 29th December 1924 | |
| X.4646 X.4646 BATTERY IGNITION RUBBING BLOCK TESTS. | Date. | Test No. | Material. | Bench or chassis. | Equiv. miles. | Wear. | Remarks. | |---|---|---|---|---|---|---| | 30-10-22 | 1 | Continental Bakelite | Bench | 10,000 | .021" | Cam unlubricated | | 29-1-23 | 2 | Bone Grey fibre | Bench | 10,000 | .008" | Cam unlubricated | | 27-4-23 | 3 | Bone Grey fibre | Bench | 10,000 | .005" | Cam lubricated | | 6-6-23 | 4 | Continental Bakelite | Bench | 10,000 | .004" | Cam lubricated | | 31-1-24 | 5 | Continental Bakelite | Bench | 10,000 | .005" | Cam lubricated every 2000 mls | | 22-2-24 | 6 | Continental Bakelite | Chassis 4GII | 10,000 | .015" | run under ordinary chassis conditions | | 22-2-24 | 7 | Continental Bakelite | Chassis 6GII | 10,793 | .007" | run under normal conditions | | 15-7-24 | 8 | Bone Grey fibre (1st Sample) | Bench | 10,000 | .002" | Cam lubricated IL | | 21-10-24 | 9 | Bone Grey fibre (1st Sample) | Bench | 10,000 | nil | cam unlubricated. Suspected absorption of oil by block during previous test IVL | 29.12.24. | ||