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 accumulator manufacturer Peto & Radford regarding battery capacity discrepancies and suggestions for a replacement.
| Identifier | ExFiles\Box 58\4\ Scan212 | |
| Date | 17th January 1935 | |
| Works. Dagenham Dock, Essex (Handwritten: r6021) TELEPHONE SLOANE 7164. 5 LINES PRIVATE BRANCH EXCHANGE TELEGRAMS CONCENTRATION, SOWEST, LONDON. Manufacturers of Accumulators for over 50 years. PETO & RADFORD Proprietors - Pritchett & Gold and E.P.S. Company Ltd. 50 GROSVENOR GARDENS, LONDON, S.W.1. YOUR REF OUR REF M/5. 17th January, 1935. Messrs. Rolls-Royce, Ltd., DERBY. (Handwritten: E HS{Lord Ernest Hives - Chair}/WW) Dear Sirs, We have your letter of the 16th inst., ROY{Sir Henry Royce}/MS.31/P, and note what you say. There is evidently a discrepancy here in the figures and we think that it would be more accurate if instead of referring to the percentage capacity of the one battery over the other, we actually had the figures obtainable at the 10-hour rate and then we can see better where we are. If you have not got these, perhaps you could get them from the Chloride Co. before Monday. We are inclined to think that our batteries perhaps give a little more capacity which is where the trouble comes in. Our Bentley battery gives 53-54 ampere hours whereas the 25 Rolls-Royce gives 55 so it is slightly more in capacity and we think your tests in the past have proved that in equal capacities the smaller number of thicker plates give a longer life. There is so little in it, however, that if you wish to make the change as you suggest, we cannot put up any strong advice to you against doing it but we would ask you to consider our other suggestion, namely, that for the reasons given, you might consider putting the 40/50 battery (6.BDH-11) on the 20/25. This battery, as you know, has a capacity of 66 ampere hours. As the whole tendency, in spite of the constant potential charging dynamos, is to raise the capacity of the battery in view of all the electrical demands being made on it and likely to be made on it, we have looked through an up-to-date replacement list and we find that:- The 12 H.P. and 20 H.P. Alvis cars, the 18 and 20 H.P. Armstrong Siddeley, all Austin models of 12 H.P. and above, all Crossleys, nearly all Daimlers, all Hillman (except Minx), all Humbers, all Invictas, all Lagondas, all Lanchesters (except 10 H.P.), | ||