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).
And diagram regarding testing procedures for a 'Concertina' top and 3rd speed sliding piece for a Phantom III Gearbox.
| Identifier | ExFiles\Box 94\2\ scan0050 | |
| Date | 28th October 1936 | |
| GRY{Shadwell Grylls} Please deal with this. Rm.{William Robotham - Chief Engineer} Hsr & Sg{Arthur F. Sidgreaves - MD} want to put Concertina pieces on production forthwith. c. E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} RHC.{R. H. Coverley - Production Engineer} 350X328 Phantom III Gearbox With reference to the testing of the "Concertina" top and 3rd speed sliding piece, we think that before we can conclude that this is satisfactory it should be tried with bushes which have whatever clearance is thought to be the maximum that will occur in practice due to limits and wear. We also think that it is important that a test for flexibility should be made at an early date as this will give an idea of the capacity of the bellows for absorbing movement. Diagram annotations: SPLITTING DEPLN. E/HDY.{William Hardy} CLEARANCE PACKING LOAD W A B Handwritten note: Rdy INCREASE LOAD IN 10LB STEPS UNTIL A PERMANENT SET OCCURS. | ||