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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).
Performance comparison table of dynamo balancing speeds under various conditions.

Identifier  ExFiles\Box 165\6\  img210
Date  20th August 1929 guessed
  
PERFORMANCE COMPARISON

Balancing speeds.

| Dynamo. | Shunt | | Controlled | |
|---| 12.4 volts cold. | 13.6 volts hot. | 12.4 volts cold. | 13.6 volts hot. |
| Later av: Gos. (29 segs) | 540 | 615 | 545 | 640 |
| H.{Arthur M. Hanbury - Head Complaints} (29 coils) | 565 | 645 | 533 | 630 |
| E.{Mr Elliott - Chief Engineer} (57 segs) | 570 | 660 | 590 | 680 |
| C. (57 segs) | ø 580 | 665 | - | 682 |
| Av. 57 seg. Goshawk. | 575 | 665 | 565 | 680 |
| 3 coil per slot armature. | | | | 640
645 |
| Std. arm. in same field. | | | | 675
680 |
| Proposed new std. 600A. | | | | 680 |
  
  


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