Question

In high latitudes the diurnal variation of the magnetic needle is

Answer 1

Answer:

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Answer 2

Answer:

• In a Paper published in the Transactions for 1823, I stated my opinion, that the diurnal variation of the needle was pro- bably due to the influence of temperature, but that the prin- ciple adopted by CANTON Would not account for the morning casterly variation. In a subsequent paper,* I pointed out that the changes in direction and intensity appeared always to have a reference to the position of the sun with regard to the mag- netic meridian ; the direction of the needle being undisturbed nearly at the time the sun passed that meridian; and the horizontal intensity being the least at the same time. Having taken this view of the subject previously to my being aware of Dr. SEEBECK's discovery, that magnetical phænomena will arise from a disturbance in the equilibrium of temperature, my knowledge of that discovery and of subsequent experi- ments, particularly those of Professor CUMMING, Confirmed me in the opinion, that temperature must have a considerable effect in producing some of the phænomena of terrestrial magnetism, although I considered that this influence might be modified by the effects produced by rotation, or by pe- culiar influence in the sun's rays.