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).
Construction and performance characteristics of an accumulator, including a table of capacity figures.
| Identifier | ExFiles\Box 164\2\ img027 | |
| Date | 1st March 1940 guessed | |
| - 2 - SEPARATORS. Single ribbed wood. 0.045" thick with 0.025" flesh. FILLARS. These have circular copper inserts extending the whole length. VENT PLUGS. Non-spill type made of ebonite and celluloid. The very small diameter is a bad feature and evidently there is trouble with distortion as each lid{A. J. Lidsey} was fitted with two ebonite supports for the celluloid tube. SPECIAL FEATURE. Each lid{A. J. Lidsey} was fitted with a level indicating device consisting of an inverted glass U tube with the open ends communicating with the inside of the cells. This device was sealed in with compound and by laying the battery on its side the correct level is indicated by a red line in the bend of the U where it projects through the sealing compound. CAPACITY FIGURES AS OBTAINED BY R.A.E. Rate amperes. Final Voltage. Capacity in ampere-hours. 3 10.8 24 5 10.8 23.6 10 10.8 20.5 50 8 17.2 100 8 16.3 (9.78 mins.) 200 8 11.0 (3.3 mins.) 300 8 2.25 (27 secs.) R.A.E. report that as compared with the 12-volt 40 A.H. type 'B' accumulator the Varta is better in high rate performance and also shows a slight advantage on the ampere-hours per pound comparison. | ||