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).
Instruction sheet regarding a special screw-cap lamp with a helical filament.
| Identifier | WestWitteringFiles\M\2April1925-June1925\ Scan4 | |
| Date | 29th June 1920 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. To_____________________19 Order No.____________ Customer's No. 3 and coil together pass .21 ampere The lamp is somewhat special as it is of the screw-cap type similar to those used for hand flash-lamps, but having a helical filament capable of operating directly on the chassis voltage Signed: H.A. This Sheet must be filed on completion of the work. RR 238 (150 BKS.) (SH57.29-6-20.) MP 224355 | ||