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).
Standard Wire Gauge (SWG) for a hold-on coil in an Actuator Box & Automatic Switch.
| Identifier | ExFiles\Box 64\3\ scan0190 | |
| Date | 6th November 1924 | |
| X8650 To BY/RD. from EFC. EFC2/T6.11.24. X.8650, ACTUATOR BOX & AUTOMATIC SWITCH. Referring to your BY/RD4/ML5.11.24 and our EFC3/T4.11.24, you will notice that we are asking for 27 SWG. for the hold-on coil, whereas you have already instruxted 26-SWG. for trial. We are now of the qinion that 27 SWG will be coarse enough and suggest that you instruct up another coil using this 27 SWG, occupying the same space, i.e. leaving the heavy current coil as instructed by your BY/RD4/ML5.11.24. EFC. | ||