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 operation and calibration of the Autovac fuel measurement system, page 2.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan282 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF He/AJL/LCG 12. 25. It will be seen from the above that the correct working of the instrument is dependent upon the same amount of petrol being drawn into the Autovac every time it functions. If more than .002 galls. is drawn in the Galometer will only register .002, or if less than this amount be drawn in, the same will be registered. The amount of petrol drawn into the Autovac float chamber is governed by the length of the working stroke of the float. This therefore is arranged to correspond to the difference in petrol level caused by the addition of .002 galls. of petrol to the float chamber. In the case of the special measuring Autovac, the stroke is .65" which, with a float chamber diameter of 3.375", produces an influx of petrol to the amount of .002 galls. It is also obvious that the same amount of petrol must be released from the float chamber each time of functioning, this is governed by the height of petrol in the outer reservoir. Fig.1. Fig.2. | ||