Philosophical Transactions of the Royal Society of London

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Royal Society of London, 1821
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Página iii - Society answerable, for the certainty of the facts, or propriety of the reasonings, contained in the several Papers so published, - which must still rest on the credit or judgment of their respective Authors.
Página 448 - A MANUAL OF CHEMISTRY; containing the principal Facts of the Science, arranged in the order in which they are discussed and illustrated in the Lectures at the Royal Institution.
Página 20 - I yesterday morning examined the produce, namely, a two-years old filly, and a year-old colt. They have the character of the Arabian breed as decidedly as can be expected, where fifteen-sixteenths of the blood are Arabian; and they are fine specimens of that breed; but both in their colour, and in the hair of their manes, they have a striking resemblance to the quagga. Their colour is bay, marked more or less like the quagga in a darker tint. Both are distinguished by the dark line along the ridge...
Página 21 - The stripes across the fore-hand of the colt are confined to the withers, and to the part of the neck next to them; those on the filly cover nearly the whole of the neck and the back, as far as the flanks. The colour of her coat on the neck adjoining to the mane is pale and approaching to dun, rendering the stripes there more conspicuous than those on the colt. The same pale tint appears in a less degree on the rump: and in this circumstance of the dun tint also she resembles the quagga [p.
Página 18 - ... This is evident, that if strong electrical currents be supposed to follow the apparent course of the sun, the magnetism of the earth ought to be such as it is found to be. But I will quit conjectures, to point out a simple mode of making powerful magnets, namely, by fixing bars of steel MDCCCXXI. D across, or circular pieces of steel fitted for making horse-shoe magnets, round the electrical conductors of buildings in elevated and exposed situations...
Página 425 - ... state than through metals. To gain some distinct knowledge on the relations of the different conductors to the magnetism produced by electricity, I instituted a series of experiments, which led to very decisive results, and confirmed my first views. II. I found that the magnetic phenomena were precisely the same, whether the electricity was small in quantity, and passing through good conductors of considerable magnitude ; or, whether the conductors were so imperfect as to convey only a small...
Página 428 - ... magnetism, and not upon the electrical inductive power of the magnet, for masses of soft iron, or of other metals, produced no effect. The electrical arc or column of flame was more easily affected by the magnet, and its motion was more rapid when it passed through dense than through rarified air ; and in this case, the conducting medium or chain of aeriform particles was much shorter.
Página 327 - Astronomical Circle, at the Observatory of Trinity College, Dublin, since the Beginning of the Year 1818, for investigating the Effects of Parallax and Aberration on the Places of certain Fixed Stars ; also the Comparison of these with former Observations for determining the Effects of Lunar Nutation. By the Rev. John Brinkley, DD. FRS. and MRIA.
Página 32 - As the transparent mucus is not only one of the most abundant materials of which the brain itself is composed, but is the medium by which the globules of the retina are kept together, and serves the same purpose in the medullary texture of the nerves, there can be no doubt that the communication of sensation and volition, more or less, depends upon it.
Página 11 - I ascertained, by several experiments, that the effect was proportional to the quantity of electricity passing through a given space, without any relation to the metal transmitting it ; thus, the finer the wires the stronger their magnetism. A zinc plate of ,a foot long and six inches wide, arranged with a copper plate on each side, was connected by a very fine wire of platinum, according to your method ; and the plates were plunged an inch deep in dilute nitric acid.

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