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).
Methods for magnetizing and testing magnets, with specific reference to experiments on Bosch magnets.
| Identifier | ExFiles\Box 4\5\ 05-page050 | |
| Date | 21th September 1914 | |
| R1/B21914. No.2 COPY powerful electro magnet and place alternately on one and the other pole the yoke of the magnet and draw it along to the point, when it has been forcibly pulled off the electro magnet. This is a very old fashioned way of magnetizing a permanent magnet, and was the only way we found we could sufficiently magnetize some separater magnets which we made many years ago. The two ways which come to my mind I endeavour to show on the accompanying sketches. A good way of experimenting with this piece of work would be to take some magnets from a Bosch magneto and carefully test the flux that they are capable of supplying. You could then demagnetise them by an electro magnet or a coil of wire and see whether you can magnetise them as well as they were originally. Secondly, some of the same original Bosch magnets, could be softened and re-hardened to see whether we could harden them and magnetise them so that by this process we could find out whether it was the steel or the hardening or the magnetising which was at fault. F.H.R. Attached sketches. | ||