Illustration of a precision physical measurement instrument, possibly a type of galvanometer or magnetometer.
| Identifier | ExFiles\Box 34\1\ Scan317 | |
| Date | 22th August 1922 guessed | |
| ", | ||
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).