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).
Results from endurance, volt-speed, and ampere-speed curve tests.
| Identifier | ExFiles\Box 48\2\ Scan068 | |
| Date | 13th July 1923 guessed | |
| -3- Contd. (7). Endurance test :- Run with hand range retarded to obtain approx. central position. Rather heavy tracking on the drums carrying segments. Carbon dust deposited round brush-holders. Brushes appear to be soft. Black marks on segments corresponding to position of brushes at break. (8) Primary volt-speed curve :- Speed. Volts. Volts/Speed. 400 1.67 .00418 800 3.09 .00386 1200 4.46 .00372 1600 5.64 .00352 2000 6.76 .00338 2400 7.85 .00327 2800 8.88 .00317 3200 10.24 .00320 3400 10.89 .00321 (9) O.C. Primary ampere-speed curve. Speed. Amperes. Speed Amperes. 100 .65 1200 1.30 200 1.00 1600 1.35 300 1.08 2000 1.39 400 1.14 2400 1.40 600 1.20 2800 1.42 800 1.25 3200 1.43 1000 1.28 3400 1.44 Contd. | ||