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 Chloride Electrical Storage Company regarding a small dry battery for emergency ignition service.
| Identifier | ExFiles\Box 164\4\ img245 | |
| Date | 24th June 1936 | |
| V6122. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY THE Chloride ELECTRICAL STORAGE COMPANY LIMITED TELEPHONES: SWINTON 2011 (7 LINES) TELEGRAMS: CHLORIDIC, PENDLEBURY. CODES: BENTLEY'S, LIEBER'S, A.I. AND A.B.C. (4TH & 5TH EDITIONS) EXIDE WORKS, CLIFTON JUNCTION, NR MANCHESTER. LONDON OFFICE, 137, VICTORIA STREET, S.W.1. OUR REFERENCE CPL/LJ. YOUR REFERENCE ..................... (Logo 1: NATIONAL SCHEME FOR DISABLED MEN) (Logo 2: FBI, FEDERATION OF BRITISH INDUSTRIES, INCORPORATED BY ROYAL CHARTER) H.E.West, Esq., Messrs.Rolls-Royce Limited, D e r b y. 24th June, 1936. Dear Mr.West, In reply to your further letter of the 23rd instant, re a small dry battery for emergency ignition service, 3 amperes is of course a rather heavy load for this type of battery and it would therefore be necessary to use fairly large cells. The most suitable size of cell I can suggest is our Drydex G50 type, which is specifically designed for discharging intermittently at 3 amperes for operating gas lighters. The approximate dimensions of each cell are 1 5/8" diameter x 4 1/2" high, and the cell voltage on continuous discharge at 3 amperes is about 1.18 volts initial, falling to 1.025 volts after 5 minutes, 0.75 after 25 minutes and 0.6 after 47 minutes. An appreciably better performance, however, would be obtained on short intermittent discharges. I am not sure what overall voltage limits you desire to work to, but I should imagine that in view of the above figures it will be necessary for you to use 12 cells in series, and these could be assembled in a carton having approximate overall dimensions of 6" x 8" x 4 1/2" high, with a total weight of about 10 lbs. We could supply you with the individual cells at a nett price of 1s.2d. each; alternatively, if you required the batteries in any quantity we could make them up as 12-cell batteries assembled in a suitable carton. Should you consider the foregoing cells to be too heavy and bulky, the next smaller size which we have | ||