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 detailing the specifications for a section piston ring.
| Identifier | ExFiles\Box 144\3\ scan0104 | |
| Date | 11th August 1936 | |
| Standard Wall Press 12-14 Lbs / Sq", L Section Wall Press 5-6 Lbs / Sq", RADIAL THICKNESS, .120 +4 -4 (EXISTING), .050 -5, 3.380 DIA +15 -5, 45°, CLOSED GAP .006 +2 -2, .0937 -1/2, .025 RAD -10, 3.500 DIA., NOMINAL CYLINDER DIA., SECTION PISTON RING (25/30), MAKE FROM E6082D COMPRESSION RING., SCALE 1/1, ROLLS-ROYCE. LTD., PRINT ROOM, 11 AUG 1936, DERBY, RM.{William Robotham - Chief Engineer}186 | ||