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 showing modifications to a resonance silencer for a 20/25 HP model.
| Identifier | ExFiles\Box 179b\2\ img028 | |
| Date | 10th October 1932 | |
| 20/25 H.P MODIFICATIONS TO RESONANCE SILENCER E.58690 (Le.C.3158) (DIMENSIONS NOT SHEWN AS ON E.58690) BAFFLE E.58684. BAFFLES E.58688 BUT WITH 6 HOLES 1/4" DIA DRILLED IN A CIRCLE EQUALLY SPACED. BAFFLES E.58684 BUT DRILLED ONLY WITH INNER RING OF 1/4" DIA HOLES. BAFFLE E.58688. THIS DIMENSION ALTERED FROM 18.00". DRILLING OF CENTRAL PIPE ALTERED TO SUIT NEW POSITION OF BAFFLE. N.B. BAFFLES TO BE FIXED TO CENTRAL TUBE, & TO BE .020 SMALLER IN DIAM. THAN THE SHELL; i.e. TO BE SUFFICIENTLY FREE TO PREVENT CONTRACTION NOISES, & NOT LOOSE ENOUGH TO RATTLE. Dimensions: 4.155, 4.195, 5.950, 21.5, 5.950, 3.00, 4.00, 8.400. Stamped text: ROLLS-ROYCE LTD PRINT ROOM OCT 10 '32 DERBY | ||