Abstract
As I have had several letters concerning my use of Dr. Gore's arrangement, depicted on p. 107 of your last week's issue, perhaps I may as well say that I am aware it is commonly regarded as a Trevelyan rocker, and that I doubt not its function in that connection. This point of view is so familiar to every one, through Tyndall's “Heat,” that I thought it unnecessary to mention it. But I have occasionally heard the motion of the ball attributed to the electro-magnetic action of the current on itself—which is impossible—and I thought it useful to point out that it could nevertheless be used as an illustration of electromagnetic force, provided a vertical magnetic field is applied as well as a current. I should imagine the earth not too weak to have an effect under favourable conditions; but of course such an effect would be strictly definite in direction, and reversible.
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LODGE, O. Gore's Railway. Nature 37, 128 (1887). https://doi.org/10.1038/037128b0
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DOI: https://doi.org/10.1038/037128b0
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