. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. V.] THE ELECTRO-MAGNET. 53 the liquid. As a result, however, hydrogen is left, having no oxygen with which to recombine, and as it is electro-positive, it attaches itself to the negative pole. Thus only at the two poles are the effects of the decomposition visible. The quantity of an electrolyte decomposed is proportional to the action in the battery; and the quantities of the different substances pro- duced at the different po
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap. V.] THE ELECTRO-MAGNET. 53 the liquid. As a result, however, hydrogen is left, having no oxygen with which to recombine, and as it is electro-positive, it attaches itself to the negative pole. Thus only at the two poles are the effects of the decomposition visible. The quantity of an electrolyte decomposed is proportional to the action in the battery; and the quantities of the different substances pro- duced at the different poles are in proportion to their chemical equivalent. Production of magnets by currents.—Let AB (Fig. 28) be a portion of a large link of soft iron, and let a thick copper wire be wound round each end, each turn being insulated from the other. The wire must be wound in such a way that, if the link were straightened out, the wire would be all in the same direction. Connect the ends of the wire with a battery of two or three Grove's cells, and an electro-magnet is formed. Let T be a bar of soft iron with a hook at- tached. While the current flows round the wire, the soft iron will become converted into a horse-shoe mag- net, of such strength as to attract the bar T, and keep it in contact though a weight of many pounds be suspended from it. Interrupt the current, then in u moment the link will lose its magnetism, and the weights will drop. The soft iron is thus only tem- porarily magnetised by the passage round it of a current. All the magnetism is not, however, lost ; some generally remains, and is called residual magnetism. The less thorough the annealing of the iron, the greater is the tendency for some degree of. Fig. 28.— Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original M'Gregor-Robertson
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