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 Peto & Radford concerning battery charging, cut-off switches, and patents.
| Identifier | ExFiles\Box 59\1\ Scan218 | |
| Date | 22th December 1927 | |
| X.4008 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 C. GOLD F.C. GRAHAM MENZIES G.R.N. MINCHIN WILLIAM PETO C.R.D. PRITCHETT T.W. PRITCHETT. YOUR REF_________ OUR REF M/5. 22nd December 1927. E.{Mr Elliott - Chief Engineer} Fowler Clark Esq., Messrs. Rolls Royce Ltd., DERBY. Dear Fowler Clark, Thank you for yours of the 19th inst. with the reports you sent me, which I am now returning to you. I have read these through with interest and have discussed the question as to whether it would be better from the battery's point of view if the full charge should be reduced to a lower one or cut off altogether and we are of the opinion that it would be better for the battery, provided it really is fully charged, to cut it off altogether. I am glad to see that Mr. Royce is interested in this device as I have agreed with you all along that I think it is better than any of the other suggested schemes, for example, Mr. Royce's danger lamp etc. I think it is always important to have an additional protection in case the normal cut-out should fail, although this happens much more on cheaper cars with cheaper electrical system and is a frequent cause of spoiling a battery but I have never heard of it happening on your well designed and well made ones. I think it is very important to observe the use of the switch on the car running on the road so as to be certain that there is no chance of the switch being operated by the high voltage of the battery and then the moment the charge is cut off the voltage falling to about 12 1/2 or 13 and so putting the switch in again and continually having it going in and out for this reason. As regards the Patent, I hope your ideas as to it being sufficiently different will be justified, but Patents are funny things | ||