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 to Mr. Minchin discussing battery overcharging, sludge, and the condition of plates.
| Identifier | ExFiles\Box 54\1\ Scan073 | |
| Date | 9th December 1925 | |
| 84617P EFC5/T. 9th December, 1925. Mr. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} R.{Sir Henry Royce} N. Minchin, 50, Grosvenor Gardens, London, S.W.1. Dear Mr. Minchin, Thank you for yours of yesterday's date just received. I am sorry, but your comments on my queries re overcharging do not seem to me completely satisfactory, and though I know you have plenty of other matters engaging your attention at the moment, I hope you will not mind my further remarks. I agree that if the paste is hard and the battery properly treated, there will not be very much sludge (though there is bound to be ultimately) in a moderate life, but still I do not see how, if you do not know the age of the battery and the hardness of the paste, what there is ultimately definitely to say that the battery has been overcharged. I rather anticipated that you would have said that there was a big difference in the negative plates between the same number of ampere hours of over-charge received in a short life at a relatively high rate, and received in a long life in small increments at low rates, whereas I cannot see that any appreciable distinction can be made out in the positives. I think perhaps, though I cannot say from my own experience, that you could reasonably say there was a distinction on the negatives, quite I am not sure that a positive plate is very good electrically as long as there is a reasonable | ||