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).
List of new, standard, and stock parts required to incorporate a Dimmer Switch on the Wraith III instrument board.
| Identifier | ExFiles\Box 168a\1\ img072 | |
| Date | 8th April 1937 | |
| c. Rm{William Robotham - Chief Engineer}/Wst. BY/RD.4/B.8.4.37 WRAITH III - INSTRUMENT BOARD. Sg.{Arthur F. Sidgreaves - MD} has specially requested that the switch for the instrument lights shall be readily found in the dark. We therefore, propose to incorporate the Dimmer Switch shown on RR.Sch.1007, blueprints of which have all been issued to you, but for your further information we are giving the list of pieces required. Will you please arrange for these to be made and fitted with the Instrument Patch to LOP. DW.191. New Parts. D.75781 - Control Knob. 1 off. D.75782 - Insulating Bush. 2 off. D.75784 - Insulating Washer. 2 off. D.75787 - Terminal Screw - Bottom. 1 off. D.75790 - Plain Washer. 1 off. D.75791 - Spring Washer. 1 off. D.75879 - Rivet - Bobbin to Base. 1 off. D.75880 - Base - Dimmer. 1 off. D.75881 - Bobbin - Resistance. 1 off. D.75882 - Contact Arm. 1 off. D.75883 - Assembly of Resistance Coil. 1 off. D.75777 - Support Plate - Instruments. 1 off. D.75778 - Case - Instrument Group. 1 off. 22 SWG. .028 dia. "Dullray" Resistance Wire. 96.000. .015 dia. Knox's Thread. 96.000. 1 m/m Sistoflex Sleeving .550 long. 1 off. Additional Standard Parts :- DB.{Donald Bastow - Suspensions}179 - Plug - Support Plate. 1 off. Stock Parts :- K.1817A. - 3 BA. Ch.Hd.{Mr Hayward/Mr Huddy} Screw (Terminals). 1 off. K.4304A - 3 BA. Locknut. (Terminals). 4 off. K.4447A - 3 BA. Plain Washer.(Terminals). 6 off. K.9005A - 3 BA. Spring Washer(Terminals). 4 off. K.1913A. - 2 BA. Ch.Hd.{Mr Hayward/Mr Huddy} Fixing Screw. 1 off. K.4404A. - 2 BA. Plain Washer. 1 off. K.3803A - 2 BA. Thackeray Washer. 1 off. Cont'd.{John DeLooze - Company Secretary} | ||