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).
Specification for an indicating mechanism using a wheatstone bridge.
| Identifier | ExFiles\Box 165\4\ img043 | |
| Date | 28th March 1928 guessed | |
| yieldable arm is interposed between carbon pile rheostats supported by the frame and constituting arms of a wheatstone bridge. (13) Indicating mechanism substantially as hereinbefore described. COPY | ||