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).
Graph comparing engine power curves from various silencer tests.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan201 | |
| Date | 27th November 1925 guessed | |
| COMPARATIVE SILENCER TESTS — POWER CURVES. ROAD WHEEL B.H.P. ENGINE R.P.M. CUT-OUT OPEN. STD SILENCER No I. No III PARTICULARS OF SILENCERS Nº I:- CONCENTRIC TUBE SILENCER FITTED WITH 3 BAFFLES E.74332 Nº III CONCENTRIC TUBE SILENCER FITTED WITH 4 BAFFLES E.74339 Y-Axis Scale: 30, 40, 50, 60, 70, 80, 90 X-Axis Scale: 500, 1000, 1500, 2000, 2500, 3000 | ||