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).
Comparison table of two different car lid types, detailing their weight, area, and weight per square foot.
| Identifier | ExFiles\Box 117\2\ scan0131 | |
| Date | 5th January 1940 | |
| - 2 - Rm.{William Robotham - Chief Engineer}E/BA.5.1.40. Make of car and type of lid{A. J. Lidsey} Weight. Area in sq.ft and weight per sq.ft. 1.S.B.1. Comprising lid{A. J. Lidsey}, cantilever support. No provision for housing tools. 47.75 lbs. Area 6.45 sq.ft. Weight. 7.4 lbs/sq.ft. Z.B.V. Comprising lid{A. J. Lidsey} strap - supported -No provision for tools. 36 lbs. Area 5.95 sq.ft. Weight. 6.05 lbs/sq.ft. Rm.{William Robotham - Chief Engineer} | ||