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 modifications to a resonance silencer for a 20/25 HP model.
| Identifier | ExFiles\Box 104\2\ scan0062 | |
| Date | 19th October 1932 guessed | |
| Hs{Lord Ernest Hives - Chair} 78 20/25 HP MODIFICATIONS TO RESONANCE SILENCER E.58690 (Le C. 3158) (DIMENSIONS NOT SHEWN AS ON E.58690) BAFFLE E.58684 BUT WITH TWO INNER RINGS OF HOLES DELETED 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 E.{Mr Elliott - Chief Engineer} BAFFLE, 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 AND TO HAVE .025" CLEARANCE BETWEEN SHELL AND THEIR PERIPHERY. 4.155, 4.195, 5.950, 21.5", 5.950, 3.00, 4.00, 8.400 | ||