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 a battery supplier inquiring about modifications and discussing the results of comparative life tests on 'sandwich' batteries.
| Identifier | ExFiles\Box 54\2\ Scan118 | |
| Date | 4th October 1927 | |
| X.4617. Sent also to The Exide Co. EFC {E. Fowler Clarke - Electrical Engineer} 2/T. EFC {E. Fowler Clarke - Electrical Engineer} 1/T. 4th October, 1927. Messrs. Peto & Radford, 50, Grosvenor Gardens, London, S.W.1. Dear Sirs, Would you please say if you have made any modifications to batteries which you are at present supplying to us as standard for our 20 HP and 40/50 HP, chassis, of a nature likely to affect the life of these batteries, since the time when you supplied our Expl. Dept. with a number of standard batteries (and some odd cells), the cells of which batteries were used by us in the making up of a number of sandwich batteries for comparative life tests. According to our records, the first group of these sandwich batteries were set going on 11.6.25. We should have received the batteries from which these sandwiches were made perhaps about a month beforehand. The point we wish to arrive at, is whether there is sufficient justification for putting in hand further life tests of up-to-date batteries types of cell, or whether the ones we have are still sufficiently representative of what we are today receiving. We are not referring to certain experimental modifications which we have asked you for and put on test in further sandwich batteries made up later than the date mentioned, and we are aware that some of our present standard batteries contain a portion of these experimental modifications, the effect of which we are observing in the sandwiches referred to. It may interest you to know that so far as our experimental sandwich batteries are concerned, starting from the date referred to, we have as yet had no failure of any kind in any cell, and that periodical tests of these batteries at high and low rate show them still to possess quite reasonable capacities. Contd. | ||