Newton's London Journal of Arts and Sciences: Being Record of the Progress of Invention as Applied to the Arts..., Volume 39

W. Newton, 1852

Wat mensen zeggen - Een review schrijven

We hebben geen reviews gevonden op de gebruikelijke plaatsen.

Geselecteerde pagina's

Overige edities - Alles weergeven

Veelvoorkomende woorden en zinsdelen

Populaire passages

Pagina 500 - ... himself with a most unnecessary attention, but assume an authority which could safely be trusted, not only to no single person, but to no council or senate whatever, and which would nowhere be so dangerous as in the hands of a man who had folly and presumption enough to fancy himself fit to exercise it.
Pagina 369 - As he that taketh away a garment in cold weather, and as vinegar upon nitre, so is he that singeth songs to a heavy heart.
Pagina 5 - Oxide of iron would most probably, therefore, enable a manufacturer accustomed to furnace operations to send into the market an arsenical compound of cobalt containing more than 50 per cent, of this metal, even if his interest failed to convince him of the great advantage resulting from its subsequent conversion into zaffre. Thus, then, the conditions of this seemingly difficult problem are answered, in a commercial sense; for oxide of iron is plentiful and cheap, its combination with silica is sufficiently...
Pagina 253 - ... the caloric is constantly wasted by being passed into the condenser, or by being carried off into the atmosphere. In the improved engine, the caloric is employed over and over again, enabling me to dispense with the employment of combustibles, excepting for the purpose of...
Pagina 4 - Many of the ores of copper, when first received by the manufacturer, are in a state quite parallel to that of the Cornish ores of cobalt, even in regard to poverty of metal. There is the same excess of granitic matrix, the same necessity for avoiding the use of any agent capable of attacking sulphuret of copper, a substance possessing very similar chemical affinities to those of the arseniurets of nickel and cobalt.
Pagina 4 - This latter, when carefully roasted in an oxidizing furnace, in contact with sand or ground flint, affords at once an impure silicate of cobalt and arseniuret of nickel — two marketable products. The Cornish ores, from their metallic poverty, will not undergo the first fusion necessary to separate the silicious matrix of the mineral. And this trifling; impediment seems actually to have benumbed the energy of that indomitable spirit of enterprise for which Britain is, in most things, justly celebrated....
Pagina 170 - Lancaster, manufacturing chemist, for certain improvements in obtaining products from ores and other matters containing metals, and in the preparation and application of such products for the purposes of bleaching, printing, dyeing, and colour making.
Pagina 521 - For a similar beam, uniformly loaded over its entire length, the strains on the diagonals commenced at the centre, increasing uniformly to the points of support; while the horizontal strains decreased from the centre to the ends, in the ratio of the ordinates of a parabola. These results were arrived at by different methods of reasoning ; and the formulae derived from them were stated to be applicable to the more complex form of a closely intersected lattice, taking into consideration the increased...
Pagina 179 - Of course, under existing circumstances, this is impossible ; for, as we hare previously remarked, the precise composition of the different clays used in the arts is totally unknown ; and, independent of any chemical difficulties that may be presumed to exist in determining this important fact for themselves, our manufacturers may justly plead that no simple and satisfactory mode of analyzing clay has yet been published. Hence the present empirical system is universal ; and the accidental admixtures...
Pagina 466 - ... other. The raw material in this case is pretty generally a black fluid, like thin treacle, which comes from Sicily, and is obtained by inspissating the expressed juice of the lemon, — the rind having previously been removed from the lemon for the sake of its essential oil. This black juice is impure citric acid, and requires to be treated with chalk, as practised with respect to the first operation on tartar ; by which means, an insoluble citrate of lime is formed ; and this, after being well...

Bibliografische gegevens