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 for a large resonant silencer for the Spectre.
| Identifier | ExFiles\Box 93\1\ scan0010 | |
| Date | 24th November 1934 | |
| LARGE RESONANT SILENCER FOR SPECTRECodename for Phantom III SCALE 1/2 NOTE. THE OUTSIDE DIMENSIONS ARE THE SAME AS ON THE PRESENT SPECTRECodename for Phantom III SILENCER. THE SWAN NECK IS OF LARGER BORE AND THE INTERNAL PARTS OF THE SILENCER ARE COMPLETELY MODIFIED. HS{Lord Ernest Hives - Chair} 1526 INLET CONE 39 - 5/16" HOLES ALL ROUND CIRCUMFERENCE. RIVET MAIN CENTRE TUBE 200 5/16" HOLES. ALL ROUND CIRCUMFERENCE. CLIP RIVET WELD SWAN NECK AND ITS BRANCH ON SILENCER TO BE SIMILAR TO HS.{Lord Ernest Hives - Chair}729 AND HS.{Lord Ernest Hives - Chair}770. 60 - 5/16" HOLES UPPER HALF OF CIRCUMFERENCE ONLY 60 - 5/16" HOLES LOWER HALF OF CIRCUMFERENCE ONLY 60 - 5/16" HOLES LOWER HALF OF CIRCUMFERENCE ONLY TOP HATS F.A.H. Dimensions: 1.000, 2.000, 2.500, 3.000, 25.000, 1.250, 1.500 O.D., 3.500 O.D., 5.250 O.D., 6.250 O.D., 1.000, 21.000, 59.400 (SAME AS PRESENT), 1.150, 4.375 O.D., 5.250 O.D., 10.250 | ||