The London Journal of Arts and Sciences, Zväzok 1

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Sherwood, Neely, and Jones, 1820
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Containing reports of all new patents, with a description of their respective principles and properties: also, original communications on subjects connected with science and philosophy; particularly such as embrace the most recent inventions and dicoveries in practical mechanics.

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Strana 303 - Pure stee lin small pieces, and in some instances good iron, being mixed with charcoal powder, were heated intensely for a long time ; in this way they formed carburets, which possessed a very dark metallic grey colour, something in appearance like the black ore of tellurium. and highly crystalline. When broken, the facets of small buttons, not weighing more than 500 grains, were frequently above the eighth of an inch in width. The results of several experiments on its composition, which appeared...
Strana 161 - Work from the surface of one piece of Metal to another piece of Metal; and to the forming of Metallic Dies and Matrices. And also Improvements in the Construction and Method of using Plates and Presses for Bank Notes and other Papers, whereby the producing and combining various species of Work is effected upon the same Plates and Surfaces, the difficulty of imitation increased, and the process of printing facilitated.
Strana 222 - To encourage and promote their peculiar science by every means in their power, but especially — by collecting, reducing, and publishing useful observations and tables — by setting on foot a minute and systematic examination of the heavens — by encouraging a general spirit of inquiry in practical astronomy— by establishing communications with foreign observers — by circulating notices of all remarkable phenomena about to happen, and of discoveries as they arise — by comparing the merits...
Strana 262 - The best cast steel is preferred to any other sort of steel for the purpose of making plates, cylinders, circular or other dies; and more especially, when such plates, cylinders, or dies are intended to be decarbonated. For the reason given above, the steel is decarbonated, solely for the purpose of rendering it sufficiently soft for receiving any impression intended to be made thereon; it is therefore necessary that, after any piece of steel has been so decarbonated...
Strana 295 - For each of the different size crucibles, he formed ten or twelve dozen of moulds of stucco, burnt and powdered in the usual manner., For the first mould of each size, * Abstracted from the Fifth Number of the Edinburgh Philosophical Journal.
Strana 379 - ... ground ; or if that be not practicable, from the nature of the country, then the soil upon which the road is proposed to be laid must be raised by addition, so as to be some inches above the level of the water.
Strana 234 - ... hundred apertures, corresponding to those below, and with an equal obliquity, but in an opposite direction. The obliquity is not necessary to the production of sound, but it serves to give motion to the plate by the passing air. The box is connected by a tube with a bellows that supplies it with air.
Strana 395 - NAiRNEja paper concerning •which was published in the Philosophical Transactions for 1777. In this paper, it is stated, on the authority of Mr. Cavendish, that water, whenever the pressure of the atmosphere on it is diminished to a certain degree, is immediately turned into vapour, and is as immediately turned back again into water on restoring' the pressure: the degree of 'pressure is different according^ to the heat of the water.
Strana 375 - The stone already in the road is to be loosed up and broken, so as no piece shall exceed six ounces in weight. The road is then to be laid as flat as possible, a rise of three inches from the centre to the side is sufficient for a road thirty feet wide.
Strana 379 - ... this cannot be effected, unless the greatest care be taken, that no earth, clay, chalk or other matter that will hold or conduct water, be mixed with the broken stone, which must be so prepared and laid as to unite by its own angles into a firm, compact, impenetrable body.

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