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3. An Electro-Magnetic Declinometer

Published online by Cambridge University Press:  15 September 2014

A. Tanakadaté  and
J. A. Ewing
A. Tanakadaté
Affiliation:
Assistant to the Professor of Physics in the University of Tokio, Japan
J. A. Ewing
Affiliation:
University College, Dundee
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Extract

The terrestrial magnetic field will in general be disturbed in the neighbourhood of an electric circuit; but if the circuit be a plane set at right angles to the terrestrial lines of force, the direction of the field will remain unchanged at all points in the plane of the circuit. To determine the magnetic meridian, we have only to place a plane circuit in such a direction that, when a current in the circuit is started and stopped, no change takes place in the position of a small magnet hung at a point in the plane of the circuit, and free to turn in azimuth. The plane of the circuit will then lie magnetically east and west.

Type
Proceedings 1882-83
Information
Proceedings of the Royal Society of Edinburgh , Volume 12 , 1884 , pp. 544 - 560
Copyright
Copyright © Royal Society of Edinburgh 1884

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References

note * page 552 [Evidently this should be 2δc, not δc. The mistake, which I have noticed only in reading the proof, does not affect the accuracy of Mr Tanakadatés conclusions as to the proper proportions of the coils; and the equations which follow, as well as the numerical values given in fig. 8, need not be altered, if we assume the excentricity of the magnetometer in the direction NS to be ½δc instead of 8c as in the text.–J. A. E. ].

note * page 553 See note, p. 552.