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 the efficiencies of different brake toggle shaft and cam systems under varying loads.
| Identifier | ExFiles\Box 84\2\ scan0354 | |
| Date | 18th July 1935 guessed | |
| PERCENTAGE EFFICIENCY GIRLING CAMS NEEDLE ROLLER BEARINGS TOGGLE SHAFT PLAIN BEARING TOGGLE SHAFT LBS. LOAD ON LAST EXTERNAL 3.5" CENTRES LEVER COMPARISON OF EFFICIENCIES OF: BENTLEY TOGGLE SHAFT WITH PLAIN BEARINGS BENTLEY TOGGLE SHAFT WITH NEEDLE ROLLER BEARINGS GIRLING CAMS EFFICIENCIES OBTAINED BY HYSTERESIS USING A SPRING LOADED CLAMP ON BRAKE SHOES. AVERAGE DIFFERENCE BETWEEN BENTLEY SYSTEMS = 6.4% | ||