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Pagina 122 - ... increased, and the undulations were feebler. At a smaller distance the surface of the mercury became plane ; and rotation slowly began round the wire. As the magnet approached, the rotation became more rapid, and •when it was about half an inch above the mercury, a great depression of it was observed above the wire, and a vortex, which reached almost to the surface of the wire.
Pagina 127 - Experiments have never been the means of discovery ; and a survey of what has been attempted of late years in physiology will prove that the opening of living animals has done more to perpetuate error than to confirm the just views taken from the study of anatomy and natural motions.
Pagina 360 - ... 6 to 5. The following Table exhibits the relative adhesion of nails of various kinds, when forced into dry Christiana Deal, at right angles to the grain of the wood...
Pagina 130 - An Account of the Effect of Mercurial Vapours on the Crew of His Majesty's Ship, Triumph...
Pagina 133 - Now, though we have not the means of ascertaining the extent of our own atmosphere, those of other planetary Bodies are nevertheless objects for astronomical investigation; and it may be deserving of consideration, whether, in any instance, a deficiency of such matter can be proved, and whether, from this source, any conclusive argument can be drawn in favour of ultimate atoms of matter in general. For, since the law of definite proportions discovered by chemists is the same for all kinds of matter,...
Pagina 338 - By invisible, but ever-active agencies, the waters of the deep are raised into the air, whence their distribution follows, as it were by measure and weight, in proportion to the beneficial effects which they are calculated to produce. By gradual, but almost insensible expansions, the equipoised currents of the atmosphere are disturbed, the stormy winds arise, and the waves of the sea are lifted up ; and that stagnation of air and water is prevented, which would be fatal to animal existence. But the...
Pagina 237 - I have used the same repeatedly, without any apparent diminution of its elastic powers. The principal advantages of this blow-pipe are its great portability, and length and steadiness of action (in which I consider it much superior to the hydraulic blowpipe), together with the perfect liberty at which, when properly mounted, it leaves the operator's hands. This blowpipe is applicable to any of the gases, and may, I conceive, be applied with advantage to contain the explosive mixture of oxygen an'd...
Pagina 133 - ... we may without hesitation conclude, that those equivalent quantities, which we have learned to appreciate by proportionate numbers, do really express the relative weights of elementary atoms, the ultimate objects of chemical research.
Pagina 268 - ... 1 : 2'56. From comparisons of the strain required to cause permanent alteration in different kinds of steel, the author concludes, that in the process of hardening, the particles are put into a state of tension among themselves, which lessens their power to resist extraneous force ; and the phenomena of hardening may be referred to the more rapid abstraction of heat from the surface of the metal than can be supplied from the internal parts, whence a contraction of the superficial parts round...
Pagina 122 - Masses of mercury of several inches in diameter were set in motion, and made to revolve in this manner, whenever the pole of the magnet was held near the perpendicular of the wire ; but when the pole was held above the mercury between the two wires, the circular motion ceased ; and currents took place in the mercury in opposite directions, one to the right, and the other to the left of the magnet.