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).
Chronological log of design modifications and key dates for the 'Change Speed Mechanism'.
| Identifier | ExFiles\Box 104\4\ scan0245 | |
| Date | 4th July 1935 | |
| To Hs.{Lord Ernest Hives - Chair} (Handwritten: X328) Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}18/KW.4.7.35. Change Speed Mechanism Original Ex.8727 knob fitted to 19-EX in 24.6.32. Design received to N.Sch.3760 for Bentley 29.6.33) First tried Design modified to N.Sch.3765 in 15.7.33 ) in 15.7.33 Further mods. to N.Sch.3819 in 14.9.33 ) to N.Sch. Bakelite knob without insert N.Sch.3851. 23.10.33) 3672. Standardisation issued 2.11.33. completed 24.11.33. First experimental isolated change speed fitted to 3-B-IV 6.11.34. Hdy{William Hardy}'s scheme to Ex. details fitted to streamlined car 8.1.35. Modified version fitted to 5-B-IV. 11.3.35. Instructed to Works by Wor.{Arthur Wormald - General Works Manager} 1.5.35. Final scheme for 20/25 received 27.5.35. To follow 21-G-IV to France. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||