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The physicist set up his quadrant electrometer after a good deal of trouble, but throughout the winter had to struggle constantly with rime forming on the parts of his apparatus exposed to the outer air. Good runs were being thus continually spoilt. The determination of the magnetic constants also took up a good part of his time.
To rid himself of this new idea, and to decentralize the illusion, he shifted his position. But still his gaze, almost against his will, turned back toward the former point, as though the blanketing blackness held some core, some discernible central point, toward which he was compelled to look, as the magnetic needle is compelled to swing toward the North.
The magnetic key with which the message was sent Produced by its action an electric current which, after traversing the line, passed through a coil and deflected a suspended magnet to the right or left, according to the direction of the current. A mirror attached to the suspension magnified the movement of the needle, and indicated the signals after the manner of the Thomson mirror galvanometer.
They followed the direction of the magnetic lines of force, and, forsaking the polar collar of the magnetised sphere, surrounded it like a ruffle. The obvious analogy with the aurora polaris and the solar corona was insisted upon by Ebert himself, and has been further developed by Bigelow.
I did make a few paragraphs of what Lincoln said in the first eight or ten minutes, but I became so absorbed in his magnetic oratory, that I forgot myself and ceased to take notes, and joined with the convention in cheering and stamping and clapping to the end of his speech.
The aperture in the rock is only about five feet in height, and extends only fifteen feet into the rock. The needle is strongly attracted around this, either by the presence of magnetic iron ore or some metallic substance buried in the interior.
The fact of terrestrial magnetism may be expressed by saying that the space within and around the whole earth is filled by lines of magnetic force, which we know nothing about until we suspend a magnet so perfectly balanced that it may point in any direction whatever. Then it turns and points in the direction of the lines of force, which may thus be mapped out for all points of the earth.
I could not conceal from myself that the talk I had had with the fellow at the Wayfarers' had somewhat discouraged me as to the ultimate success of my efforts to expose him, and as days went on I found it impossible entirely to shake off the impression made by his words. His personality was disagreeably magnetic to me.
He was forced to admit that some women, indeed many, would be as clay in the hands of the man who possessed those long-lashed, magnetic eyes. He thought of the pretty manicurist. Mortification he had read in her white face, and pain; but no anger. Yes, Ormuz Khan was dangerous. In what respect was he dangerous? "Phil Abingdon!"
That Morse's fellow-countryman, Joseph Henry, chiefly prepared the way for that triumph, the following account, with just emphasis, demonstrates. Ampère was the first and is the most famous investigator in electrodynamics. He also invented a telegraphic arrangement in which he used the magnetic needle and coil and the galvanic battery.
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