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).
Diagram of a sparking plug, type Bologna S.6, with component labels and specifications.
| Identifier | ExFiles\Box 58\2\ Scan152 | |
| Date | 11th September 1934 | |
| S.P. 451. GAS SPACE VOLUME = 1.6 C.C. LEAKAGE PATH = 6.5 M/M WEIGHT = 3 ozs. 7 DRAMS. DEPT: ELECTRICAL & IGNITION DRAWN: J.{Mr Johnson W.M.} Carson TRACED: L.E.B. 23-8-34 CHECKED: C.U. ~1/9/34 APPROVED: G.E.Saints 11-9-34 Issued by:- Directorate of Technical Development AIR MINISTRY DRG Nº E&I 5236. Fig. 1. STEEL STEM. BRASS LOCKING NUT. MICA WRAPPED. MICA WASHERS. STEEL GLAND NUT. 7/16" WHIT. COPPER WASHER. PLUG BODY. NICKEL H.T. ELECTRODE. END OF BUSH SPUN OVER. EARTH ELECTRODE. SPARKING PLUG. TYPE:- BOLOGNA. S.6. E&I. 5236. .5" 2.2" .92 A/F 1/2" WHIT. | ||