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).
Weight comparison list of electrical components between Humber and R.R. models.
| Identifier | ExFiles\Box 126\2\ scan0186 | |
| Date | 19th August 1939 | |
| 19.8.39. WEIGHTS. HUMBER. R.R. lbs.ozs. lbs.ozs. Battery ................. 72 8 66 0 Headlamps ............... 9 10 19 12 Spot Lamps .............. 5 0 4 2 Horns ................... 8 7 8 0 Horn Relay .............. - 1 8 Wiring - Loom & Clips ... 7 15 13 9 Wiper Motor ............. 3 0 3 0 Fuse Box & Regulator .... 1 8 2 10 Sidelamps ............... 9 8 Stop, Tail, Reverse Lamps . 1 4½ 1 4½ Fuse Box, Junction Box ....) 8 1 2 Stop Light Switch .......) Battery Earth Cable ..... 6½ 5 110-12 121-12½ = + 11 lb -1- | ||