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).
Test results for Lucas Headlight Dimmer current measurements under various lamp configurations.
| Identifier | ExFiles\Box 61a\1\ scan0123 | |
| Date | 6th November 1918 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To________________ 19__ Order No__________ Customer's No. Z. Lucas Headlight Dimmer. | Lamp | No | Arrangement | Dimmer | Amps | Remarks | |---|---|---|---|---|---| | Metal filament 12v. 24 watt | 1 | - | out | 2.5 | | | | 1 | - | in | 1.78 | | | | 2 | series | out | 1.63 | | | | 2 | parallel | in | 2.65 | 1.325 each | | Half-watt 14v. 24 watt | 1 | - | out | 1.78 | | | | 1 | - | in | 1.475 | | | | 2 | series | out | 1.27 | | | | 2 | parallel | in | 2.40 | 1.20 each. | Inst. 40 was used with the 15.0 amp range, for the above table, and with the 15.0 volt and 1.5 amp ranges for the resistance measurements. Signed F.J. Allen This Sheet must be filed on completion of the work. | ||