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).
Testing and performance of a Hobson K-S petrol level indicator on experimental cars.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 64 | |
| Date | 24th December 1926 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to BJ. Wor.{Arthur Wormald - General Works Manager} ✓ c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} ORIGINAL Hsl/LG24.12.26. HOBSON K-S PETROL LEVEL INDICATOR. X8896 We are running on two of the experimental cars (one Phantom and one 20 HP.) a petrol level indicator which is mounted on the instrument board and gives a direct reading of the petrol in the tank. Attached herewith are diagrams which shew how it operates. There are no moving parts. We have found the indicator quite reliable. The only disadvantage we have found with it is that the scale is rather cramped. There is a definite limit to the depth of the 'U' tube one can fix on the instrument board. Whereas this may be perfectly satisfactory for a small 6 or 8 gallon tank, it becomes very crowded when it has to register 20 gallons. On the other hand however, one soon gets to know at a glance within a gallon how much petrol there is in the tank. The scheme for replenishing the air we consider is very ingeneous. We have proved that it does work by breaking the air line and joining it up again. We found if we ran the car on the road, it gradually built up. It took 30 or 40 miles running before the reading was normal but this of course is a very extreme condition. It is an American invention and is fitted to a large number of American cars. Our experience so far proves contd :- | ||