A simple law of the magnetic circuitThu Aug 9, 2012 17:4072.201.40.216A simple law of the magnetic circuit
KESEABCH ON THE ABSOLUTE UNIT OF ELECTRICAL
[American Journal of Science L8], XV, 283-291, 825-836, 480-489, 1878]
Since the classical determination of the absolute unit of electrical resistance by the Conunittee on Electrical Standards of the British Association^ two re-determinations have been made, one in Oermany and the other in Denmark, which each difiPer two per cent from the British
Association determination, the one on one side and the other on the other side, making a total difference of four per cent between the two.
Such a great difference in experiments which are capable of consider- able exactness, seems so strange that I decided to make a new determination by a method different from any yet used, and which seemed capable of the greatest exactness; and to guard against all error, it was
decided to determine aU the important factors in at least two different ways, and to eliminate most of the corrections by the method of experiment, rather than by calculation. The method of experiment depended upon the induction of a current on a closed circuit, and in this respect, resembled that of Kirchhofif, but it differed from his inasmuch as, in my experimei4> the induction current was produced by reversing the main current, and in Eirchhofifs by removing the circuits to a distance from each other. And it seems to me that this method is capable of greater exactness than any other, and it certainly possessed the greatest simplicity in theory and facility in experiment.
In the carrying out of the experiment I have partly availed myself of my own instruments and have partly drawn on the collection of the University, which possesses many unique and accurate instruments for electric and magnetic measurements. To insure uniformity and accuracy, the coils of all these instruments have been wound with my own
hands and the measurements reduced to a standard rule which was
^ I am greatly Indebted to Mr. Jacques, Fellow of the University who is an
excetlent observer, for his assistance daring the experiment, particularly in reading the tangent galvanometer.
146 Henky a. Rowland
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http://books.google.combooks?id=41BGAQAAIAAJ...1871 - Science Paine** Electro-magnetic To the Editor of the Scientific American: Having noticed ... articles in your paper with reference to Paine's electro-magnetic machine, ...
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