Test report on the charging potential difference of P&R and Exide standard 6-volt unit batteries.
| Identifier | ExFiles\Box 168b\3\ img029 | |
| Date | 20th January 1930 | |
| JD {J. Draper - Frames} 49 X7535 20-1-30 676. X7535 Charging P.D's on P&R & Exide Std 6 volt unit Batteries. Tests have been made on the New Std P&R & Exide 6 volt unit batteries having the improved modifications as outlined in JD {J. Draper - Frames} 48 3-1-30. The batteries were put in a tank filled with water which was artificially heated to any required temperature. The battery was then connected in series with a charging circuit. The charging P.D's were taken at various rates of charge at any temperature which could be fixed & the readings plotted on a graph. It will be seen that the PD is higher on the P&R than on the Exide. g.f. | ||
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).