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).
Test results comparing the voltage rise and dynamo output of various battery cells.
| Identifier | ExFiles\Box 54\2\ Scan079 | |
| Date | 29th June 1920 | |
| RR 236(150 BKS.)(SHDT.29-6-20.) MP 224368 ROLLS-ROYCE LTD. INSTRUCTIONS. To ___________ 19__ Order No. ___________ Customer's No. 5 The tests show that the largest rise of voltage (and consequent dynamo peak output) takes place on the P & R cells, Oldham and Fuller coming close and Exide least (apart from the SPL.1 example which failed to gas up properly.) Signed: F.P.A. This Sheet must be filed on completion of the work. | ||