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).
Definition and explanation of the properties of a 'rigidly magnetised body' and its associated magnetic field.
| Identifier | ExFiles\Box 35\1\ scan 175 | |
| Date | 11th August 1920 | |
| R.R. 2/4A/100 T. (S.H. 159, 11-8-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 280 -5- Contd. A RIGIDLY MAGNETISED BODY* is a magnetised body whose system of lines of magnetisation is fixed and unaltered by changing circumstances, but changing magnetic influences will cause changes in the system of lines of force inside and outside the material, and therefore also in the system of lines of induction in and out of the material. Note that distribution of free magnetism on a rigidly magnetised body is fixed and therefore its own field of force is definite. An electric current of fixed value flowing in any form of circuit is like a rigidly magnetised body, in that static external magnetic influences will not alter the current value, and therefore also will not alter the magnetic field proper to that current carrying circuit. A given system of rigidly magnetised bodies and current carrying circuits has a definite magnetic field of force. The introduction of other magnetic material into this system does not alter the magnetisation of the bodies, but of course, may take up magnetisation itself and so alter the distribution of magnetic force in the system. If the magnetisation of the original system is altered, the original field is not so-called rigid. contd. + Hypothetical only. | ||