Modification drawing for a vacuum pump piston for an S.S. engine.
| Identifier | ExFiles\Box 64\1\ scan0044 | |
| Date | 28th June 1938 | |
| V.641. FOR ALL OTHER DIMENSIONS SEE E78795. SECTION THRO' DD IS UNALTERED. SECTION "DD". .550 ±5 .875 DIA. CUTTER. .900 ±5 .125 ±5 SCALE 1/1. MODIFICATION TO VACUUM PUMP PISTON. (S.S. ENGINE) HDP 28.6.38 | ||
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).