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 results log for a Coshank Dynamo, detailing performance under cold and warm conditions.
| Identifier | ExFiles\Box 51\1\ Scan378 | |
| Date | 6th June 1924 | |
| -3- X.4383 - R.R. COSHANK DYNAMO. X43604do. Date | Dynamo Number. | (3) Cold condition. | (4) Output. | (5) Warm condition | (6) (7) (8)&(9) Remarks. Temp. (ºC) | C.C. volts at 800 r.p.m. (12.4). | Cont. Shunt. | after 20 mins. at 1430 r.p.m. Amperes. | Volts. | C.C. volts at 700 r.p.m. (13.6). 21.12.23. | B 57 seg's | 17 | 585 rpm for 12.4 volts. | 13.25 | 12.0 | 14.8 | 635 rpm. for 13.6 v. {VIENNA} | 7.1.24. | 184 | 17 | 13.6 | 13.8 | 12.5 | 14.9 | 9.0 | 6. Slight sing. 7 fair sparking. 8 Slightly stiff spots. 9 down. 14.1.24. | F set gen'l spec'n. | 22 | 14.3 | - | 12.9 | 15.1 | 9.7 | 14.3.24. | L Twin brush gear. | 19 | 12.7 | 13.0 | 11.0 | 14.8 | 16.1 | 19.5.24. | 917 | 18 | 12.8 | - | 11.6 | 14.8 | 15.5 | 6-9 OK. Springs +.75 -.5 c .3 6.6.24. | ||