Smith's Rheostat for Bentley Chassis models 10BV and 3B50.
| Identifier | ExFiles\Box 97\2\ scan0055 | |
| Date | 30th March 1939 | |
| 400 Rm {William Robotham - Chief Engineer} /RC. {R. Childs} By {R.W. Bailey - Chief Engineer} /RD. 1/B 30 3 39 Bentley Chassis 10 B V and 3 B 50. Re Smith's Rheostat file 1328 | ||
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).