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).
Letter to Mr. G.R.N. Minchin discussing the development and performance of an auto switch.
Identifier | ExFiles\Box 59\1\ Scan240 | |
Date | 31th January 1928 | |
X4008 EFC3/T. 31st January, 1928. Mr. G.R.N. Minchin, 50, Grosvenor Gardens, London, S.W.1. Dear Mr. Minchin, Thank you for your offer in connection with the GF. cells. The owner is away from the Works for the time being and I think the matter will now have to rest in abeyance until his return. With regard to the auto switch, I think the remark written on my letter to the effect that this was undergoing minor improvements rather mis-led you into thinking that it was not as good as we thought. As a matter of fact our original models which were knocked up in the Laboratory were much better than the three we had put through with detailed drawings and instructions. These were slightly different, and had certain faults not contained in the original ones, which we did not foresee. We have now had alterations instructed and the one we have just put on a 10,000 mile test car is as good as our original model. We consider that it is working equally satis- factorily with the original half charge type (which is still more original than the original ones spoken of above). It was originally Mr. Royce's suggestion to cut the charge off altogether, and then we worked and developed the instrument to that end. We are almost completely satisfied with the working. Really we have only struck one slight thing which we consider a snag and that is the rise of resistance with temperature difficulty which is due to the fact that the switch operates at a very much lower voltage when cold, and that it may be set for too high a voltage when hot so there may be danger in hot weather of the switch not working at all, because as fast as the voltage rises the coil heats up more and takes still more volts to operate it, i.e. in some circumstances, although it may work cold, it may never catch Contd. | ||