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).
Four battery discharge curve graphs from tests conducted in 1920.
| Identifier | WestWitteringFiles\D\May1920\ Scan67 | |
| Date | 26th March 1920 | |
| Top Right Graph (18): Chloride E.{Mr Elliott - Chief Engineer} 26/3/20 Volts per div. = .485 Amps per div. = .41 Ohms in Circuit = 1.175 No. of hours discharge = 5.45 Top Left Graph (27): Chloride P.H.R.7 15/4/20 volts per div = .485 Amps per div = .41 Ohms in Circuit = 1.175 No. of hours discharge = 5.4 Bottom Right Graph (33): Tudor R.F.I. 4/5/20 Volts per Div = .48 Amps per Div = .41 Ohms in Circuit = 1.175 No. of hours discharge = 4.37 Bottom Left Graph (30): Willard Thread Rubber 20/4/20 volts per div = .485 Amps per div = .41 Ohms in circuit = 1.175 No. of hours discharge = 5.25 | ||