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).
Diagram illustrating the operation of an Autovac moving float mechanism.
| Identifier | ExFiles\Box 40\4\ Scan209 | |
| Date | 2nd February 1927 guessed | |
| [ "AUTOVAC MOVING FLOAT", "TOP LIMIT OF FLOAT MOVEMENT", "SELF DRAINING DEVICE", "BOTTOM LIMIT OF FLOAT MOVEMENT" ], | ||