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).
Electrical specifications for the Lucas HF Horn No. HF.722.
| Identifier | ExFiles\Box 59\3\ Scan182 | |
| Date | 7th July 1932 | |
| X6032 COPY FOR FILES. 7.7.32. LUCAS HF{H. W. Frost - Coachwork Inspector} HORN No. HF.{H. W. Frost - Coachwork Inspector} 722. Current consumption at 13 volts - 3.8 amperes. -------- Minimum working voltage 5.5 volts. Hs{Lord Ernest Hives - Chair}/Wst. | ||