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 dynamo performance, charging rates, and an automatic charge-reducing switch.
| Identifier | ExFiles\Box 59\1\ Scan110 | |
| Date | 26th January 1927 | |
| Y4008 Works, Dagenham Dock, Essex. TELEPHONE VICTORIA 3667. 5 LINES PRIVATE BRANCH EXCHANGE. 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 F.C. GRAHAM MENZIES G.R.N. MINCHIN WILLIAM PETO C.R.D. PRITCHETT T.W. PRITCHETT. YOUR REF OUR REF M/5. 26th January 1927. E.{Mr Elliott - Chief Engineer} Fowler Clark Esq., Messrs. Rolls Royce Ltd., DERBY. Dear Fowler Clark, I have now returned from abroad and find your letter of the 14th inst. I hope what we have offered to Mr. Day is what he wants. You ask how the dynamo giving the reduced charging rate on my car is doing. Unfortunately, I did not take the car away this time so it has not been used for some weeks, but up to the time I left it was all right and I shall now be resuming the use of it and can tell you more later. Of course, the reduction on that machine is very drastic and much more than we asked for, but I will let you know later. I am slowly coming to the conclusion that I do not like the Tungsten points and I do not think they are as good as platinum, but what is your idea about this? I am glad to see that you have got your automatic charge reducing switch on to a car now. I do not think I did see the first report that you mention, I only saw one a long time ago where you mentioned that you were going to try such a device, but I note the latest report and the curve that you give. The reduced output curve would be a very nice charging rate for a 20 H.P. battery, but I am rather alarmed to see the top curve of all which appears to be a sort of standard output curve for a 20 H.P. dynamo. This goes over eleven amperes and is a good | ||