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).
Blueprint of a plate with multiple circular cutouts and various mounting holes.
| Identifier | ExFiles\Box 15\7\ Scan124 | |
| Date | 2nd November 1929 guessed | |
| 12.000, 4.800, 4.000, 2.400, 1.875, .625, 2.000, .593, A, B, C, D, E, F, G, H, 3.510 DIA, 3.250 RAD, 1.830 RAD, 1.250 RAD, 2.500 R, .500R, 1.850 R, .250 RAD, .125 RAD, 1.500R, 4.015R, 2.810 DIA, .375 RAD, 1.275 R, 3.610 DIA, 2.000 RAD, .300 RAD, .200 RAD, 1.100, 2.300, 54°, 2.575 R, 1.250 R, 2.000 R, .400 RAD, .300 RAD, .125 RAD, .450 RAD, .275, 1.200, 1.400, 1.225 RAD | ||