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).
Design improvements for a petrol level indicator glass and washer assembly.
| Identifier | WestWitteringFiles\J\May1923\ Scan0 | |
| Date | 1st May 1923 | |
| ORIGINAL TO SY. FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence.) C. to CJ. BJ. MOR. PN.{Mr Northey} C. to HS.{Lord Ernest Hives - Chair} RE. GOSHAWKS. RE. INDICATOR FOR PETROL LEVEL. X3596 This works extremely well and is very useful. The glass however is badly made and arranged. The one on No.4. is broken. Firstly, it should be smoothly cast and ground on the edge, not roughly cut with all kinds of surfaces to start cracks inwards. One would think a very cheap way to produce these would be to cast a disc of the correct size and grind and polish the surfaces as you would a lens, but more simply, as it is flat. Secondly, is there no toughened glass that would be less liable to crack. Thirdly, a petrol proof washer of cork or leather, quite parallel, should be used both above and below, of the same diameter as the thread:- [Diagram Annotation Handwritten] THREAD QUITE FREE TO UNIVERSAL [Diagram Annotation Typed] THREAD MILLED - NO RECESS FOR WASHER TO DROP IN with petrol; test for water tightness by overfilling the tank see that there is nothing in the gauge to be spoiled with petrol. I have also suggested that a celluloid disc in case of breakage. R.{Sir Henry Royce} | ||