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 drawing of a slow running plug (F.1.).
| Identifier | ExFiles\Box 13\3\ 03-page286 | |
| Date | 2nd April 1921 | |
| V1030, .313 DIA, DRILL .075 DIA, ANNULAR RING, .050 RADIUS, .250 +/- 5, .025 THICK, .300 DIA +/- 2, .375 DIA +/- 2, .150 +/- 2, 1.015 +2, 1.065 -2, .170 +/- 5, MAT : BRASS, SLOW RUNNING PLUG (F.1.), DRILL .075 DIA, .040 +/- 1, .100 +/- 4, C'SINK .132 DIA, 3 B.A. THREAD, R6/28, 2.4.21 | ||