Licence: Public Domain Mark
Credit: On atmospheric magnetism / Professor Faraday. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![amount of change in the conducting power of the air for given changes of temperature, and then to apply that in the endeavour to ascertain whether the amount of change to be expected is (as well as the direction) accordant with that which really occurs. M. F. In the Library were exhibited :— Gilbert, de Magnete ; Kircher, de Arte Magnetica; Churchman’s Magnetic Atlas ; and the Magnetical Observations at Greenwich, St. Helena, Toronto, and Bombay; and Col. Sabine’s Unusual Magnetic Disturbances ’ ’ [from the Royal Institution Library]. Minerals from Texas, collected and presented by W. Bollaert, Esq. Portrait of Mr. Faraday by A. Blaikley, Esq. Candelahras presented to the Marquis of Tweeddale [by Messrs. Hunt and Roskell]. Model of Anchor invented by Commander Inglefield, R.N. M.R.I. Fairhurn’s Machine for Making Cotton-Cards [by Mr. Fairburn, C. E.] “A Retriever First Proof of an Engraving by H. T. Ryall, from a Drawing by Sir E. Landseer [by Mr. J. L. Grundy]. New Water-mark in Bank-note paper, and Specimen of Paper split in three [by Mr. Oldham]. Nine Flints with Fossil Sponges, &c. from Salisbury; a large piece of Native Copper, with Native Silver, Calcareous Spar &c. part of a piece weighing 30 tons from Lake Superior [by Mr. Tennant].' Talbotypes and Photographs [by Messrs. Henneman and Malone].](https://iiif.wellcomecollection.org/image/b22376963_0006.jp2/full/800%2C/0/default.jpg)
