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 a battery supplier regarding voltage rise characteristics and the supply of test cells.
| Identifier | ExFiles\Box 54\5\ Scan099 | |
| Date | 17th June 1926 | |
| X 3839 Works. Dagenham Dock, Essex TELEPHONE VICTORIA 3667. 4 LINES PRIVATE BRANCH EXCHANGE. 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 F.C. GRAHAM MENZIES G.R.N. MINCHIN WILLIAM PETO C.R.D. PRITCHETT T.W. PRITCHETT TELEGRAMS CONCENTRATION, SOWEST, LONDON. YOUR REF_________ OUR REF M/5. 17th June 1926. Messrs. Rolls Royce Ltd., DERBY. For the attention of Mr. Fowler-Clark. Dear Sirs, With regard to the voltage rise, we find that the batteries we are now making for you do not exceed 2.7 volts per cell on charge as certain steps have been taken to achieve this, but it does rise if the battery is allowed to get slightly sulphated at any time. This, however, appears to be a feature common to all other makes of batteries and we are rather at a loss at the moment to do much with regard to this. With regard to the three R.R.11 cells you have ordered, these will be sent to you in a few days. We have recently varied the pasting of these plates with a view to giving longer life and also helping the voltage rise and have altered the methods for some weeks now after the result of tests. As, however, you are going to give these three cells such a very careful life test under actual running conditions we wondered whether you would have any objection to us supplying two of them with the plates as pasted at present and one with the plates as previously pasted. These will also have the latest type separators with the wood ribbed on each side and the wood and ebonite carried above and below the plates. This feature will not appear in your production batteries for another two or three weeks, and if you are conducting any further tests on completed batteries we would ask you to make certain that they are of the most recent manufacture, because we have seen quite a number of improvements introduced in the last few months. Please let us know about the three R.R.11 as soon as possible. Yours faithfully, PETO & RADFORD. G R N Minchin | ||