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).
Graph showing the volt-ampere characteristics of double ballast resistances.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan126 | |
| Date | 2nd September 1926 | |
| VOLT-AMPERE CHARACTERISTICS OF DOUBLE BALLAST RESISTANCES. AMPERES VOLTS. .5, 1.0, 1.5, 2.0, 2.5 2, 4, 6, 8, 10, 12, 14, 16 O A □ B Δ C X D.{John DeLooze - Company Secretary} A - 34" OF 34 SWG WIRE B - 39" " 33 " " C - 44" " 32 " " D - 50" " 31 " - STD GAUGE HEW 2-9-26 | ||