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).
Inspection report on the condition of four chassis dynamos after road testing.
| Identifier | ExFiles\Box 51\1\ Scan326 | |
| Date | 7th January 1924 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} AR.97. COPY Prof Allen 7th Jan. 24. (X4383) CHASSIS DYNAMOS UNDER OBSERVATION. The four dynamos below have been inspected at the beginning of the new year for general condition after running various distances on the road. A on 2GII. Fitted 13.10.23 with old commutator slotting and new bevelled 2 brushes. Noticed on dynamometer giving an excessive output (over 15 amperes). Negative brush eased and spring replaced, but later battery terminal found loose. Mileage run (partly on low gears) 1120. Positive brush dull, negative fairly smooth; commutator in good condition. D on 4GII. Fitted 4.10.23 with standard 1/2 bevelled fairly free in the holders, and machine-slotted commutator. Run 2460 miles, positive brush good, negative fairly good, commutator in good condition; springs rather light (positive .7 lb. negative .6 lb control .3 lb) but brushes worn at the start. An 83° sentinel on this machine became broken but was replaced by one which has remained intact. 470 on 6GII. Fitted 17.10.23 with ZOO bevelled brushes and machine-slotted commutator. Springs within standard pressure limits. Ran 3303 miles, positive brush is black with bright leading edge, negative good, commutator is a uniform light brown. An 88°C sentinel has run most of the time on this machine and has not melted. E3 on 7GII. Fitted 4.10.23 with EG2 bevelled brushes. run 1457 miles and returned to make positive brush bevelling more effective. Run a further 2466 miles (total miles 3923), brushes very good, well polished, commutator fairly good, slightly irregular light brown. The inspections were made with machines in situ, where the control brush is not accessible. EFC {E. Fowler Clarke - Electrical Engineer} /RJA. | ||