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).
Specification sheet for a ballast resistance component and its associated assembly.
| Identifier | ExFiles\Box 163\7\ img061 | |
| Date | 2nd November 1925 guessed | |
| -2- Contd. (f) Ballast Resistance. This is wound on a porcelain insulator, protected by a metal casing, and is carried on the outside of the distributor casing. Its resistance cold is 2.24 ohms, and when carrying 1 ampere current 2.74 ohms. The whole, combined with an automatic cam advance governor housed underneath the contact breaker, forms a neat compact unit and weighs complete only 3 lbs. 2 ozs. EFC/HEW. | ||