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).
Patent blueprint for a rotary compressor, showing two views with dimensions.
| Identifier | ExFiles\Box 149\5\ scan0120 | |
| Date | 7th June 1928 guessed | |
| 5-PISTONS 5/8 DIA. ON 1 1/4" P.C.D. 4 - FIXING STUDS 1/4" WHIT. FLANGE TO BE 5/16" THICK WITH CENTRAL BORE 2 3/8" ROTARY COMPRESSOR PATENT JOHN.F.N.CRAIG 9 REGENT STREET S.W.1. SKEFKO BEARING 2904 1/2 3/8 DIA SHAFT 7/8 DIA 14 m/m 5/16" 5/16" 1/8" 3/16" 3 1/4" 5/16" 1/4" 45° 1 1/2" 1/8" 3/32" 1/4" 11/32" 1 5/8" 2 3/8" 4 1/8" 6" 1047. | ||