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).
Letter from an accumulator manufacturer discussing ebonite separator thickness and battery performance.
| Identifier | ExFiles\Box 54\1\ Scan095 | |
| Date | 1st April 1926 | |
| X.4617P. Works, Dagenham Dock, Essex TELEPHONE VICTORIA 3667. 5 LINES PRIVATE BRANCH EXCHANGE. [LOGO: MOTOR TRADE ASSOCIATION] [LOGO: INCORPORATED 1905] [LOGO: SOCIETY OF MOTOR MANUFACTURERS & TRADERS LTD] TELEGRAMS CONCENTRATION, SOWEST, LONDON. Manufacturers of P&R Accumulators. Established 1889 PETO & RADFORD Proprietors - Pritchett & Gold and E.P.S. Company Ltd. 50 GROSVENOR GARDENS, LONDON. S.W.1. DIRECTORS: SIR ARCHIBALD G.{Mr Griffiths - Chief Accountant / Mr Gnapp} GOLD K.C. GRAHAM MENZIES G.R.N. MINCHIN WILLIAM PETO C.R.D. PRITCHETT T.W. PRITCHETT. YOUR REF OUR REF M/5. 1st April 1926. E.{Mr Elliott - Chief Engineer} Fowler Clark Esq., Messrs. Rolls Royce Ltd., DERBY. Dear Fowler Clark, Thank you for your letter of the 30th ult. re ebonite separators and for the exceedingly interesting reports contained therein. I note that the Exide ebonite separation varies from .305 m/m to .48 m/m.{Mr Moon / Mr Moore} The actual stuff that we measured out of an Exide cells was, I think, .38 m/m.{Mr Moon / Mr Moore} It is interesting to see that in the case of the Exide battery the separation was rubbed through as I have seen in our own batteries in the past, but I note that you think the question of thickness of the separation should be left to the battery makers. Mr. Preston, I think, wants us to stick to the .4 m/m instead of the .6 m/m we are using, but I still do not feel quite happy about this and would like to see it thickened up just a little bit and I must discuss this further with Mr. Preston. I note the performance of the two batteries which you say are about equal, but I think that ours has done rather harder work, it has had so many more miles on the road (28,000 against 15,000) and this is, I think, the most servere test. And also, ours has had to do all this in a very much shorter time. | ||