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 on the principles of magnetism, defining concepts like magnetic force, magnetisation, and induction.
| Identifier | ExFiles\Box 35\1\ scan 171 | |
| Date | 29th October 1920 | |
| R.R. 844/100 T. (S.H. 119. 11-5-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2800 X. 2713 -1- 29.10.20. X. 2713 - NOTES ON MAGNETISM. It is necessary to keep clearly in mind the meanings of the three things :- (1) Magnetic force (H) (2) Magnetisation. (M) (3) Magnetic Induction (B) Corresponding to these we think of :- (1) Lines of magnetic force. (2) Lines of magnetisation. (3) Lines of magnetic induction. Actual lines of course, are hypothetical, but it is convenient to consider unit intensity of each of the above three quantities as represented by one line per square centimetre. MAGNETIC FORCE. (1) The magnetic force at any point is the intensity of the magnetic field in the space at that point, whether the point be in magnetic or non-magnetic material, or in vacuo. When the point is in any kind of matter, we must consider the lines of force to belong properly to the space occupied by the matter and not to the matter itself. In any matter, magnetic force produces magnetic induction, the former must be considered the cause, the latter the effect. Contd. | ||