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But before I could press the trigger, from somewhere down the starlit deck an electro beam hit me. The little rifle exploded, broke its breech. I sank back to the floor, tingling from the shock of the hostile current. My hands were blackened from the exploded powder. Carter seized me. "No use. Hurt?" "No." The stars through the dome windows were swinging.
The old system of plating is still carried on both in Sheffield and in Birmingham; improvements have been introduced by the employment of a white metal instead of copper as the foundation, and by grafting on, as it were, silver tips to forks and silver edges to prominent ornaments; but the balance of advantage in economy and facility are so greatly in favour of the electro- plating process, that, no doubt, when the patents under which it is now worked expire, its use will become universal.
About the same time George H. Grace used an electro magnet on the automatic line with such good effect that the speed on the New York-Washington circuit was increased to 450 words per minute. Then a platina stylus or pen was substituted for the iron pen in connection with iodide paper, and the speed increased to 900 words per minute.
The application of electro- metallurgy at this time was confined to the manufacture of steel, as the smelting of iron had not emerged from the experimental stage of its development, though extensive trials on a large scale of various furnaces have been undertaken in Europe and by the Canadian government at Sault Ste. Marie, where the Heroult furnace, soon to be described, was employed.
The "butterfly clock" of Lemoine, which we illustrate in figure 89, is an improved type, in which the bob of soft iron P swings to and fro over the poles of a double electro magnet M in circuit with a battery and contact key. When the rate is too slow the key is closed, and a current passing through the electromagnet pulls on the pendulum, thus correcting the clock.
A motor of ordinary type, with electro field magnets, is unsuitable for traction, as it cannot be reversed by changing the direction of the current, unless a special and rather expensive type of automatic switch be used. While a motor of this kind is, in conjunction with such a switch, the most efficient, the motor with permanent field magnets is preferable as regards cost and ease of fixing.
There is no fundamental reason which forbids that when electro deposition is resorted to for the recovery of a metal from its ore it should be straightway converted to the shape and to the purpose for which it is ultimately intended.
The force systems force-and-torques, or pairs of forces required to prevent them from moving will be mutual and opposite, and will be the same as, but opposite in direction to, the mutual force systems required to hold at rest two electromagnets fulfilling the following specification: The two electro magnets are to be of the same shape and size as the two bodies, and to be placed in the same relative positions, and to consist of infinitely thin layers of electric currents in the surfaces of solids possessing extreme diamagnetic quality in other words, infinitely small permeability.
A remark about the crops falls on barren ground; a question concerning the dairy, ignorantly hazarded, is received with so much hauteur that at last you see such subjects are considered vulgar. Then a touch of the bell, and decanters of port and sherry are produced and our wine presented to you on an electro salver together with sweet biscuits.
This is from that author's work entitled, "Electro Metallurgy," American edition: "The cyanide of potassium, so often alluded to while treating of the metallo-cyanides, may be formed in several ways. It may be obtained by heating to a dull redness the yellow ferrocyanate of potash, in a covered vessel, filtering and rapidly evaporating it.
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