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 Messrs. Peto & Radford discussing the charging and discharging parameters of electrical cells.
| Identifier | ExFiles\Box 61\1\ scan0020 | |
| Date | 21th March 1924 | |
| X 2565 EFCl/T. 21st, March, 1924. Messrs. Peto & Radford, 50, Grosvenor Gardens, London, S.W.1. For the attention of Mr. Minchin. Dear Sirs, Answering yours M/C.203 of the 20th inst., we do not think the points referred to are of sufficient importance to warrant a special visit of your Mr. Preston. The only query of any consequence is that on the Instruction card it says "Never charge at less than the minimum rate specified". The whole purpose of these cells is to act as a reservoir, i.e. at one moment to function as a sink of electrical energy generated by small dynamos and going through the main charging circuits, and at another moment to act as a source of energy for various kinds of tests. Hence the current through the cells will be according to circumstances, of any value between perhaps 40 amperes charging at one time, and 150 amperes discharging at another time (e.g. on motor tests). But it is assumed that ^the batteries will charge up efficiently if the amperehours are put through them in the charging direction at a low rate of only, say, 3 or 4 amperes. Is not this the case ? Or is it a fact that cells are not Contd. | ||