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).
The charging potential difference (P.D.) of a new Peto & Radford battery, comparing it to previous models and Exide batteries.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 1 | |
| Date | 1st February 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} Da.{Bernard Day - Chassis Design} c. By.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} c. PN.{Mr Northey} ORIGINAL EFC1/T1.2.27. Y664 xobjP CHARGING P.D. OF LATEST P & R BATTERY. Ref. of previous report concerning charging P.D's at various rates of current - EFC1/T26.6.26. Please find attached copy of curve shewing the terminal P.D. on charge at various rates of current of up-to-date standard P & R RR11/3 40/50 HP. battery, from which it will be seen that Messrs. Peto & Radford have succeeded in considerably reducing the terminal P.D. on charge, and therefore the fluctuation of voltage on the electrical system if such a battery is used. Maximum P.D. is nearly 1 volt less than previously. The battery was, of course, in a fully charged condition, and it was observed that readings were consistent when taken with charging current increasing or decreasing between the readings. The shape of the curve is rather different from that obtained with Exide batteries, shewing a larger rise of voltage in the earlier stages. But it is thought that Messrs. Peto & Radford have now reduced this charging voltage to an extent which can be considered as satisfactory as the circumstances of the case will allow. The thin line represents the suggested charging characteristic of 17 volts at no current, with 1 volt drop for every 4 amperes of charging, and the point where it crosses the battery curve indicates that the final rate Contd. | ||