| Reference number | AP/64/13/1 |
| Level | Item |
| Title | Unpublished manuscript, 'The influence of stress and strain on the physical properties of matter. Part III - Magnetic induction' by Herbert Tomlinson |
| Date | 1887 |
| Description | Tomlinson presents the results of experiments extending over a period of ten years on the effects of stress and strain on the magnetic permeabilities of iron, nickel, and cobalt. Two methods are described. In one, the metal to be tested -- usually in the form of wire -- is placed with its axis coincident with that of a magnetising solenoid, in most cases of considerable length as compared with the diameter of the wire. A secondary coil is wrapped around the central portion of the solenoid. A similar pair of primary and secondary coils, with a similar piece of the same specimen of metal, is balanced against the first by means of resistance coils, so that on closing the magnetising circuit no deflection is produced in a delicate Thomson's galvanometer suitably connected up with the resistance coils and secondary coils. The alteration of magnetic permeability produced by stress was measured by the change necessary to be made in the resistance coils in order to restore the balance. In the second method, the resistance coils are dispensed with, and only a metal core used in one of the two pairs of solenoids which are connected in series each to each. The arrangements are such that the pairs of solenoids, when without any cores, balance each other’s effects on the galvanometer, so that the deflections of the latter instrument are due only to the magnetic permeability of the metal to be tested. The alteration of permeability is in this case measured by the change of deflection produced in the Thomson’s galvanometer. The second method is the one principally employed in Tomlinson's experiments.
Includes five pages of drawings of experimental equipment and 21 charts of experimental results.
Subject: Physics / Electromagnetism
Received 17 March 1887. Read 31 March 1887. Communicated by William Grylls Adams.
Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 42 of the Proceedings of the Royal Society as 'The influence of stress and strain on the physical properties of matter. Part III. Magnetic induction'. |
| Extent | 167p |
| Format | Manuscript |
| Physical description | Ink and graphite pencil on paper |
| Access status | Open |
| Related material | DOI: 10.1098/rspl.1887.0045 |
Fellows associated with this archive
| Code | Name | Dates |
| NA6980 | Tomlinson; Herbert (1846 - 1931) | 1846 - 1931 |
| NA8034 | Adams; William Grylls (1836 - 1915); scientist and university teacher | 1836 - 1915 |