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).
Table of test results for various types of electrical cells under different conditions.
| Identifier | ExFiles\Box 44\5\ Scan012 | |
| Date | 22th April 1926 guessed | |
| -2- Type of cell tested. | Condition of cell. | Terminal voltage. | Positive Plate. | Negative Plate. ---|---|---|---|--- Fuller | Discharged with standing | 2.0 | 2.17 | .17 Hispano Slem. | " | 1.80 | 2.00 | .20 " | " | 1.40 | 1.75 | .35 Std. R & R 40/50. | Shorted. | 1.30 | .25 | 0 " | Charged & charging | 2.75 | 2.50 | -.3 Std. Exide 40/50. | Charged & standing. | 2.10 | 2.20 | .1 Std. P & R 40/5C. | " | 2.10 | 2.20 | .1 C.A.V. SPRR. | Discharged but charging. | 2.10 | 2.25 | .15 Exide 6XR3. | Discharged & discharging. | 1.80 | 2.05 | .20 P & R TBD7. | " | 1.75 | 2.00 | .25 It will be seen that some show themselves to be positively weak, others negatively weak, and one is weak in both cases, whilst others are O.K. in respect of both. This method seems to be a reliable way of testing cells provided a very sensitive voltmeter is used. GJ. | ||