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 data for a Smith type A dynamo with both old and new cut-outs, under hot and cold conditions.
| Identifier | WestWitteringFiles\D\March1920\ Scan50 | |
| Date | 16th March 1920 | |
| Contd. -6- Ck{Mr Clark}2/T16.3.20. Dynamo:- Smith type A.{Mr Adams} Cut-out:- Old Smith. Condition. | Volts. | Amperes. | Speed. | Corresponding approx. dynamo balancing speed. Cold: 1. | 12.5 | -- 2. | 12.6 | +.1 3. | 12.5 | -1.0 4. | 11.9 | -- In this section, Speeds are 480 and 470. Corresponding balancing speeds are 500 and --. Hot: 1. | 15.0 | -- 2. | 13.8 | 1.5 3. | 13.5 | -.70 4. | 13.2 | -- In this section, Speeds are 630 and 580. Corresponding balancing speeds are 600 and --. Dynamo :- Smith type A.{Mr Adams} New Smith Cut-out. Cold: 1. | 12.5 | -- 2. | 12.5 | 0 3. | 12.4 | -1.2 4. | 11.5 | -- In this section, Speeds are 450 and 430. Corresponding balancing speeds are 440 and --. Hot: 1. | 14.9 | -- 2. | 13.9 | 2.0 3. | 13.5 | .70 4. | 13.4 | -- In this section, Speeds are 580 and 520. Corresponding balancing speeds are 525 and --. Contd. Footer Text (faint): W B 532 V (100 J) (2 L 81C 0/8/19) C 3490 | ||