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 detailing test results for Edison batteries intended for use in self-starters.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page250 | |
| Date | 23th December 1913 | |
| X.50 X.50 Wor{Arthur Wormald - General Works Manager}/SM13/L231213 December 23rd. 1913. A.{Mr Adams} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Ionides Esq., 278 East Park Road, Leicester. X.50 Dear Sir, We understand that you were making some enquiries concerning the behaviour of Edison batteries, especially as to their capability of giving off much energy over a short period such as would be required for a self starter. Below we give some figures that we have recently obtained ourselves from a test we have recently made with a set of Edison Cells. (1) Battery of 9 cells fully charged 13.05 volts. Weight without box 44 lbs. | Amps. | Volts. | Finish. | |-----------------------|------------------------------------------|----------| | Discharged for 5 mins. at | Start 5 mins. rest between each test. | | | 10 amps. | 13.05 v.{VIENNA} | 10.65 v.{VIENNA} | | 15 | 12.85 " | 9.6 " | | 20 | 12.65 " | 8.2 " | | 25 | 12.35 " | 6.7 " | | 30 | 12.05 " | 5.45 " | | | After 30 mins. rest 12.3 volts. | | | ||