Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1867 Excerpt: ...malleable and cast iron produces so considerable a modification of thermo-electric properties, that, while a thermo-electric battery of malleable iron and bronze causes the needle of the galvanometer to be deflected to the left, a similar battery of cast iron and bronze causes a deflection to the right. The discovery of this curious fact led H. Arnould Thenard to make experiments with a battery consisting of malleable and of cast iron; and the results he obtained indicated other anomalies which could scarcely have been anticipated. Thus, with a battery consisting of malleable iron and bronze, the deflection was found to be + 23% and with a battery of cast iron and bronze--11 5; and it might be supposed that with a battery of malleable and cast iron the deflection would be 23 + 11"5 = 34"5. Such, however, was not found to be the case; the deflection actually produced being only 27. The electro-motive force of the throe kinds of battery was in accordance with what might be expected: that of malleable iron and bronze, cast iron and bronze, and malleable iron and bronze being represented respectively by the numbers G91, 263, and 953: the last being very nearly the sum of the other two taken together. Oxtgen Obtained From Atmospheric Aie.--Our ordinary modes of obtaining oxygen for experimental and other purposes are very costly or very troublesome. It may, however, be procured with great facility through the medium of permanganate of soda, which, as it may be used over and over again, for the purpose, will entail but a trifling expense. Atmospheric air is passed over a solution of the permanganate, which, after a while, becomes saturated with the oxygen it has absorbed, the nitrogen having passed off. To separate the oxygen from the solution, a curren...
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