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).
Chart recording the test results of an Exide TR battery charge.
| Identifier | ExFiles\Box 54\2\ Scan133 | |
| Date | 14th July 1926 | |
| 14-7-26 Exide TR. {Capt. F. W. Turner - Finance} 75 a.h. 100 lbs. Charged at a continuous current of 6 amperes. Average amperes - 6.44 Hours - 8.75 Ampere hours - 56.3 .563 1.80w TRADE MARK "MCCGERT" | ||