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XXXIII. Electro-Magnetic Experiments and Observations

Published online by Cambridge University Press:  17 January 2013

Thomas Stewart Traill  and
William Scoresby
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Extract

The interesting discoveries of Oersted, and the subsequent researches of Ampere, Arago, Davy, and Von Buch, which promise to throw a clearer light on the mysterious nature of Galvanism and Magnetism, induced us to undertake, and pursue conjunctly, a series of Electro-magnetic experiments. In prosecuting our inquiries in this new branch of scientific investigation, we have observed various interesting facts, some of which appeared to us new, while others did not seem to have been detailed so fully as their importance merited.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 9 , Issue 2 , 1823 , pp. 465 - 480
Copyright
Copyright © Royal Society of Edinburgh 1823

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References

page 465 note * Annals of Philosophy, vol. ii. p. 282.

page 466 note * In this paper, where it is not otherwise specially indicated, the deflection, to either hand, means the deflection of the North Pole of the needle.

page 467 note * The liquid which we found most convenient, is 1 part of nitric acid with 30 parts of water, and ½ a part of sulphuric acid. The zinc plates were made according to Messrs Silvesters' and Robson's patent, now in the hands of Messrs Philips, George and Co., about inch in thickness; the connecting wires and helices were of copper, or of brass wire, from to inch in thickness; the helices most used had a diameter of about 2 inches; and the needle employed was either a small pocket compass, with an agate cap, or a naked needle, supported on a fine point fixed at right angles on a glass rod.

page 470 note * Those unaccustomed to such operations, find some difficulty in distinguishing between a right and a left helix; but if it be placed on one end, the spires of a right helix rise in the direction of the sun's diurnal course; those of a left helix in the opposite direction.