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 for a Smith Lyne A dynamo with an Old Smith cut-out and a Smith type 2D dynamo with a New Smith cut-out.
| Identifier | ExFiles\Box 3\5\ 05-page198 | |
| Date | 16th March 1920 | |
| Contd -6- CK{Mr Clark}2/T16.3.20. Dynamo:- Smith Lyne 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 the Speed column for the Cold section, the values are: 480, 470. In the Balancing Speed column for the Cold section, the values are: 500, --. Hot. 1. | 15.0 | -- 2. | 13.8 | 1.5 3. | 13.5 | -.70 4. | 13.2 | -- In the Speed column for the Hot section, the values are: 630, 590. In the Balancing Speed column for the Hot section, the values are: 600, --. Dynamo :- Smith type 2.D. New Smith Cut-out. Cold. 1. | 12.5 | -- 2. | 12.5 | 0 3. | 12.4 | -1.2 4. | 11.5 | -- In the Speed column for the Cold section, the values are: 450, 430. In the Balancing Speed column for the Cold section, the values are: 440, --. Hot. 1. | 14.9 | -- 2. | 13.9 | 2.0 3. | 13.5 | .70 4. | 13.4 | -- In the Speed column for the Hot section, the values are: 580, 520. In the Balancing Speed column for the Hot section, the values are: 625, --. Contd. | ||