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).
The Autovac Galometer, an instrument for registering the volume of petrol used by an engine.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan281 | |
| Date | 9th December 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} CWB. c. to BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} ORIGINAL Expl. No. REF: Hs{Lord Ernest Hives - Chair}/AJL/LG9.12.25 THE AUTOVAC GALOMETER. X3579 The Autovac Galometer is an instrument designed to register the volume of petrol used by an engine fitted with the Autovac petrol feed system. Principle of action. The recording instrument is connected up to the Autovac float chamber by a copper pipe. The instrument itself consists of a flexible spring loaded diaphragm - attached to the diaphragm are two small arms which engage with ratchets connected to the recording drums. In the normal position the diaphragm is flat, but when the Autovac vacuum is connected to the instrument via the connecting pipe, the diaphragm is distorted backwards against the spring carrying the two small arms with it at the same time turning the recording drums through 36°. When the Autovac float chamber is fitted and the vacuum released, the diaphragm is sprung back to its original position by the spring at the same time turning the recording drums through another 36°. Thus, every time the Autovac float chamber is fitted, the recording drums are moved through 72° - this movement represents .002 gallons. The measuring Autovac designed to be used with the Galometer is made to draw in .002 gallons of petrol every time it functions. The Galometer itself is fitted with an automatic spring loaded release valve to safeguard the instrument in the event of a back-fire. contd :- | ||