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).
Drawing of a piston for a Humber Snipe.
| Identifier | ExFiles\Box 126\2\ scan0140 | |
| Date | 18th November 1938 guessed | |
| HUMBER SNIPE - PISTON 12 HOLES EQUALLY SPACED 1/8 DIA 4 HOLES EQUALLY SPACED 1/8 DIA DIAMETRICALLY OPPOSITE SLOT SLOPING DOWN AT 60° TO VERT. NURAL GUDGEON PIN BOSS. SS.{S. Smith}210. Dimensions: 3 21/32" 1/4" 3/32" 1/8" 5/32" 7/32" 1/8 DIA 5/32 DIA 2.000" 1 3/8 DIA 15/16 DIA 3/16 DIA 3 9/64 DIA: 3 5/64 DIA: 3 5/16 DIA: 2 1/64" 1 1/4" | ||