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).
The design and sourcing of ball bearings for a 40 m.m. gun mounting for the Navy.
| Identifier | ExFiles\Box 175\3\ img052 | |
| Date | 6th August 1940 | |
| C.T.S. Fred Hardy is making some enquiries about this for your absence. 3 SECRET. To Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} from Ev.{Ivan Evernden - coachwork} c. to Rm.{William Robotham - Chief Engineer} Am File Gun re non elevating Mounting for 40 m.m. Gun Type BD.{Mr Berend} We are likely to have to design and build a quantity of non elevating mountings for the 40 m.m. gun Type BD.{Mr Berend} for the Navy. The only ball bearing in the design is Hoffman Deep groove No.XLS.5 size 5" x 7" x 3/4". We have been asked by Rm.{William Robotham - Chief Engineer} to suggest that you get into touch with The Hoffman Manufacturing Co.Ltd. with a view to ascertaining whether a quantity of such bearings are in stock, or if not what delivery can be offered. If this bearing is not available by a suitable date, could they tell us of a similar bearing having a bore of 5" or slightly more which would be obtainable. P.T.O. | ||