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).
Instruction sheet on the condition of a 20hp Dynamo 470 after completing 17,270 miles.
| Identifier | ExFiles\Box 50\5\ Scan369 | |
| Date | 1st September 1925 | |
| RR 235 (100 BKS.) (RH {R. Hollingworth} 87.29-6-20.) MP 22435E ROLLS-ROYCE LTD. INSTRUCTIONS. To: EFC. {E. Fowler Clarke - Electrical Engineer} Order No. AC. 57. Customer's No. X Date: 1. Sept. 1925 20hp Dynamo 470 from GF.68. This machine has now completed 17270 miles running (10460 on 4GII and 6810 on GF.68.) and been replaced by dynamo B with 19slot armature. The condition is much as reported in AJS.1/H5-3-25 from West WitteringHenry Royce's home town, the positive brush being now almost worn down to the limit the surface being smooth but not polished. The other brushes are polished and not greatly worn. The commutator is smooth, but dark in colour and is very little worn. There is a considerable deposit of brush dust (EG2 grade) and all the holders broke down to earth on 200 volts a.c., the armature however being OK. Signed: HH. This Sheet must be filed on completion of the work. | ||