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).
Notification of an alternative steel material for the 40mm Type BD gun barrel.
| Identifier | ExFiles\Box 176\3\ img124 | |
| Date | 19th August 1940 | |
| To RM.{William Robotham - Chief Engineer} O/C HPS.{Horace Percy Smith - Experimental Factory Mgr} O/C BIK. O/C Dy{F R Danby}/MM. Ve/NP.5/CB.19.8.40. 40 mm. TYPE BD{Mr Berend} GUN. Please note that the barrel for the above gun, drawing No. Q.1712, may now be made in Admiralty OO steel as an alternative to Vibrac (50 tons yield), minimum Ve/NP. | ||