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).
Parts list and manufacturing instructions for solenoid and valve components, marked as page 2.
| Identifier | ExFiles\Box 163\1\ img050 | |
| Date | 23th February 1939 | |
| BY/RD.4/B.23.2.39. -2- DW.822 - Tube - Solenoid Bobbin. 1 off. DW.823 - End Piece - Solenoid Bobbin. 1 off. DW.824 - End Piece - Solenoid Bobbin. 1 off. DW.829 - Inner Casing. 1 off. DW.834 - Backing Plate - Valve. 1 off. DW.836 - Joint Washer. 1 off. DW.838 - Return Spring. 1 off. DW.839 - End Cover - Tap Body. 1 off. DW.840 - Tap Body. 1 off. DW.921 Valve Facing, can be produced from the existing pieces to DW.833. The coils for these 6 units should be wound with 28 SWG. S.C.C. as this wire is already available, and will allow any coils which are wound to be used up. Blueprints are sent herewith to HPS.{Horace Percy Smith - Experimental Factory Mgr}, together with 1 set of blueprints to Roy{Sir Henry Royce}/Les.{Ivan A. Leslie} This completes the instructions. BY/RD. | ||