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).
Graph chart recording an Exide battery discharge test.
| Identifier | ExFiles\Box 54\2\ Scan191 | |
| Date | 10th July 1924 | |
| 45. 10-7-24. 146. Exide 6.R.R.S/1/2 103 lbs. 80 a.h. E Average amperes = 6.5 Hours = 13.33 Ampere hours = 86.6 -.840 1.80w | ||