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).
Test report on modified components including a 'Concertina' 3rd speed coupling.
| Identifier | ExFiles\Box 94\2\ scan0037 | |
| Date | 7th October 1936 | |
| -2- Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}2/KW.7.10.36. (4) (C) modified to have double the radii in the sharp corners and a little more metal on the broken part :- Same tests but omitting the shock engagements as these were considered an excessive condition. Slight distortion has taken place but the parts are in good condition and not cracked. The smaller driving surface has not worn. (5) "Concertina" 3rd speed coupling to prevent gears coming out of mesh. 4 hours full torque on dynamometer. 10 ascents and descents of Bwlch-y-Groes. This is the first sample of this coupling to be tested and is so far satisfactory. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||