Transactions, American Philosophical Society (vol. 5, 1837)

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American Philosophical Society
 

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الصفحة 222 - The effect appears somewhat increased by coiling the wire into a helix ; it seems also to depend in some measure on the length and thickness of the wire. I can account for these phenomena only by supposing the long wire to become charged with electricity, which by its re-action on itself projects a spark when the connection is broken...
الصفحة xv - Notes and Diagrams illustrative of the Directions of the Forces acting at and near the Surface of the Earth, in different parts of the Brunswick Tornado of June 10, 1835.
الصفحة 221 - ... when a small battery is moderately excited by diluted acid, and its poles which should be terminated by cups of mercury, are connected by a copper wire not more than a foot in length, no spark is perceived when the connection is either formed or broken ; but if a wire thirty or forty feet long be used instead of the short wire, though no spark will be perceptible when the connection is made, yet when it is broken by drawing one end of the wire from its cup of mercury, a vivid spark is produced.
الصفحة 227 - Feb. 17. — Mr. Faraday gave an account of the first two parts of his researches in electricity ; namely, Volta-electric induction and magneto-electric induction. If two wires, A and B, be placed side by side, but not in contact, and a Voltaic current be passed through A, there is instantly a current produced by induction in B, in the opposite direction. Although the principal current in A be continued, still the secondary current in B is not found to accompany it, for it ceases after the first...
الصفحة 363 - Description of an Electrical Machine, with a Plate, four feet in diameter, so constructed as to be above the operator ; also of a Battery Discharger employed therewith, and some observations on the causes of the Diversity in the Length of the Sparks, erroneously distinguished by the terms Positive and Negative, by R.
الصفحة 364 - Between these forceps, and those at F, supported and insulated by the glass column C, a wire is stretched, which may be of various lengths, according to the angle which the plates SS make with each other. The pedestal should be metallic, or have a metallic plate at bottom, in communication with the external coating of the battery. This being accomplished, it is only necessary to charge the battery, without subsequently breaking the communication between the inner coatings of the jars, and the prime...
الصفحة 207 - Observations to determine the magnetic dip at Baltimore, Philadelphia, New York, West Point, Providence, Springfield, and Albany, (made jointly with Professor EH Courtenay.) Trans.
الصفحة 398 - A voltaic series fixed in a trough is combined with another trough destitute of plates, and of a capacity sufficient to hold all the acid necessary for an ample charge. The trough containing the series is joined to the other lengthwise, edge to edge ; SO that, when the sides of the one are vertical, those of the other must be horizontal. The advantage of...
الصفحة 398 - The advantage of this is, that by a partial revolution of the two troughs, thus united, upon pivots which support them at the ends, any fluid which may be in one trough must flow into the other, and, reversing the movement, must flow back again. The galvanic series being placed in one of the troughs...
الصفحة 395 - This figure illustrates a new and instructive method of effecting ebullition by cold. The apparatus consists principally of a glass matrass, with a neck of about three feet in length, tapering to an orifice of about a quarter of an inch in diameter. The bulb is bulged inwards, in the part directly opposite the neck, so as to create a cavity capable of holding any matter which it may be desirable to have situated therein. In addition to the matrass, a receptacle, holding a few pounds of mercury, is...

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