Schematic for an interior heater fitted on a 40/50 HP car, chassis 20 E.X.
| Identifier | ExFiles\Box 137\1\ scan0144 | |
| Date | 28th October 1932 guessed | |
| Hs {Lord Ernest Hives - Chair} 745 INTERIOR HEATER AS FITTED ON 40/50 HP CAR 20 E.X. No. Hs. {Lord Ernest Hives - Chair} 745. LAST CORE PLUG HEATER TAPS U.737A TO BE FOLLOWED BY A PROPER SCHEME FROM THE D.O. | ||
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).