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).
Notes providing remaining information and corrections for the unfinished drawing of a Silent Starter Main Switch Unit.
| Identifier | WestWitteringFiles\L\April1924-June1924\ Scan52 | |
| Date | 15th May 1924 | |
| ORIGINAL SECRET. TO BY.{R.W. Bailey - Chief Engineer} FROM E.{Mr Elliott - Chief Engineer} Copy to - CJ. HS.{Lord Ernest Hives - Chair} ERC. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. SILENT STARTER MAIN SWITCH UNIT. x9650 Referring to drawing LeC. 1870. it was necessary owing to lack of time to send you this drawing in a somewhat unfinished state. We therefore send you the following notes representing the remaining information required:- View No. 1. The cover shewn in this view is not correct. See View 6. for the proper form. The cover and base are bakelite mouldings. The base also in this view is not correct as regards the fixing bolts spacing. Refer to View No.9. The standards in this view shewn supporting the top bridge should be insulated at their lower ends as in view 11. This view also shews the bobbin for the non inductive resistance which is connected in parallel with the magnet winding of the main switch itself. View No.2. The cover in this view is not correct - see view 6. The upper coil on the bobbin is the "hold-on" winding. This winding will probably carry a current of about 6 amps. The top flange of the bobbin should be securely riveted to the magnet core as shewn as it forms a tableland for carrying the bridge, and it also carries the "hold-on" contact. The hold-on coil makes connection with its contact by means of a sheet copper end flange to which the inner end of the winding is soldered. This flange is provided with a cylindrical portion making it angular in form so that it does not slip through the insulation and touch the core. This cylindrical portion is cut and (1) | ||