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 The Chloride Electrical Storage Company regarding modifications to battery plate moulds and terminal studs to prolong battery life.
| Identifier | ExFiles\Box 168b\3\ img091 | |
| Date | 9th October 1929 | |
| X7535E ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED LONDON OFFICE, 137, VICTORIA STREET. S.W.1. CLIFTON JUNCTION, NR MANCHESTER. TELEPHONES:- PENDLETON 481 (6 LINES) TELEGRAMS:- CHLORIDIC, PENDLEBURY CODES:- BENTLEYS, LIEBERS, A.1. AND A.B.C. (4TH & 5TH EDITIONS) OUR REFERENCE ECM/LJ. For attention of Mr.E.Fowler Clark. Messrs.Rolls-Royce, Ltd., Derby. 9th October, 1929. Dear Sirs, Further to the visits of Mr.Dean and the under-signed to Derby and consultations with Mr.Fowler Clark, we are proceeding with the modification of the plate mould to reduce the width of the plate in order to allow for more side expansion. After full consideration we have decided to reduce the width by 1/8". In order to prolong the life of the battery, which we gather from your experience has usually terminated through vertical growth of positive plates and eventual short-circuiting on the underside of the negative group bar, we are lifting the bar to the maximum height (determined by the position of the lid{A. J. Lidsey}), and we are also modifying the top bar of the positive so that that portion under the negative group bar is horizontal. A sample grid will be sent to you as soon as the mould is altered. We have carried out tests on various terminal studs to arrive at the best means of anchoring, and we are sending you under separate cover three samples, which you will easily recognise. One of the samples is the present standard; another embodies the suggestion made by Mr.Fowler Clark, viz., the provision of two cylindrical cut aways in the sides of the stud; the third sample has a key at the base and an annular groove in the stud. The second one was quite 100% better than standard, and the third was nearly 50% better than the second one. We therefore propose to adopt the last of these designs. Yours faithfully, THE CHLORIDE ELECTRICAL STORAGE COMPANY, LTD. E.C.McKinnon Chief Engineer. | ||