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).
Material and design changes for a Sump Drain Plug, including a new locking mechanism.
| Identifier | ExFiles\Box 19\4\ Scan168 | |
| Date | 20th August 1930 | |
| R.{Sir Henry Royce} c. Sg.{Arthur F. Sidgreaves - MD} c. Hs.{Lord Ernest Hives - Chair} 47772' BY1/G.20.8.30. L.H. P.11. SUMP DRAIN PLUG Lec. 2788. The above plug was instructed and made in mild steel, nickel deposit finish, which made Mr. Hancock mistake it for aluminium, but I did not like the unlocked phosphor bronze insert, and as we had to order to production I arranged the insert with a shallow hexagon to enable us to lock it positively by a stamped out plate secured to the crankcase by two small countersunk screws, locked by turning metal into the groove for screw driver. We are instructing that R.{Sir Henry Royce} specifies viz. plug screwed into aluminium direct, with coarse thread, experimentally. BY.{R.W. Bailey - Chief Engineer} [initials] [STAMP: RECEIVED AUG 20 1930] | ||