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).
Electrical specifications for a Weston Revs Per Minute Indicator, Model 267.
| Identifier | ExFiles\Box 33\5\ Scan067 | |
| Date | 13th October 1925 | |
| V1607 13.10.25. X.1782 - WESTON REVS PER MINUTE INDICATOR INSTRUMENT MODEL 267. No. 37043. V1807 Millivolts for full scale deflection 520. Milliamperes for full scale deflection 13.5. Hence resistance of instrument 38.5 ohms. ------------------ EFC. | ||