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 comparing test figures for modified and standard batteries at a temperature of 50°F (10°C).
| Identifier | ExFiles\Box 58\3\ Scan206 | |
| Date | 4th May 1931 | |
| X6054A. Hs{Lord Ernest Hives - Chair}/GJL/AD. 4th May, 1931. Messrs. Peto & Radford, Dagenham Dock, Essex. For the attention of Mr. Pritchett. Dear Sirs, We regret the delay in replying to your letter ref. CCFP/CL. of the 12th March. In answer to your queries regarding the tests on the 3-RRN-11 test battery having the modified negatives, we would say that tests were made under similar conditions on this battery as with the standard battery. The figures obtained were compared with those of a new standard battery which had had about one months' service. For your information we give below a few of the figures obtained at a temperature of 50°F.{Mr Friese} (10°C.). Modified Battery Charging Amperes. Charging P.D. 2 8.20 4 8.37 8 8.59 10 8.68 12 8.73 Standard Battery. Charging Amperes Charging P.D. 2 8.00 4 8.20 8 8.41 10 8.50 12 8.59 We hope this is the information you require and thank you for informing us as to the circumstances of writing to yourselves or the National Accumulator Co. Yours faithfully, | ||