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 Tungstone Products Ltd. discussing the specifications and alternative constructions of a battery.
| Identifier | ExFiles\Box 164\2\ img007 | |
| Date | 1st April 1939 | |
| Contractors to General Post Office, War Office, Air Ministry, Crown Agents for the Colonies, British and Foreign Railways. Directors: WILLIAM HADDON, B.Sc., A.M.I.A.E. (Chairman). H.{Arthur M. Hanbury - Head Complaints} T. APPLETON. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} BARROW. Entirely of British Manufacture. Covered by a Series of Patents, Designs and Trade Marks in the Chief Countries of the World. Your Ref. Our Ref. FJB/MJ. TUNGSTONE Strengthened Plate BATTERIES Regd Trade Mark TUNGSTONE PRODUCTS Ltd. TUNGSTONE WORKS, MARKET HARBOROUGH. 6021 Telegrams "Typify, Fleet, London." Telephones: Central 8156 (4 lines) & 8159 Cables: "Dilutum, London." Works: Market Harborough Telephone No. 2459. 1st April, 1939. Messrs. Rolls Royce Ltd., D E R B Y. Dear Sirs, For the attention of R.{Sir Henry Royce} M.{Mr Moon / Mr Moore} Child, Esq., Experimental Dept., Further to the interview which you had with our Mr. F.{Mr Friese} J.{Mr Johnson W.M.} Brown on Friday, we have pleasure in stating that the ampere-hour capacity of the battery which you have under test is 60 a.h. at the 10 hour rate. The battery which you have is the one built with our detachable connectors, as we thought you would like to judge the merits of these for your use. We should further point out that it is more expensive from our production point of view, and we could as an alternative put forward the same type of battery, but with lead burnt connectors. This would reduce the weight by quite 2 lbs. We should also point out that the battery which you have is in moulded ebonite container, as our experience shows us that there is nothing like an ebonite container to give perfect intercell insulation and prevent deterioration of partitions after about 2 years of use. We should be glad to let you have a sample of our latest battery with burnt connections if you wish. Assuring you of our best attention at all times. Yours faithfully, TUNGSTONE PRODUCTS, DIRECTOR. | ||