The Repertory of Patent Inventions, and Other Discoveries and Improvements in Arts, Manufactures, and Agriculture: Being a Continuation, on an Enlarged Plan, of the Repertory of Arts and Manufactures ...

T. and G. Underwood, 1805

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Seite 165 - Now KNOW YE, that in compliance with the said proviso, I the said Charles Frederic Mollersten do hereby describe and ascertain the nature of my said invention, and in what manner the same is to...
Seite 115 - A minute analysis of the sand is seldom or never necessary, and its nature may be detected in the same manner as that of the stones or gravel. It is always either siliceous sand, or calcareous sand, or a mixture of both. If it consist wholly of carbonate of lime, it will be rapidly soluble in muriatic acid, with effervescence; but if it consist partly of this substance, and partly of siliceous matter, the respective quantities may be ascertained by weighing the residuum after the action of the acid,...
Seite 114 - The weights of the vegetable fibres or wood, and of the gravel and stones, should be separately noted down, and the nature of the last ascertained ; if calcareous, they will effervesce with acids ; if siliceous, they will be sufficiently hard to scratch glass ; and if of the common aluminous class of stones, they will be soft, easily cut with a knife, and incapable of effervescing with acids.
Seite 180 - The productiveness of soils must likewise be influenced by the nature of the subsoil, or the earthy or stony strata on which they rest ; and this circumstance ought to be particularly attended to, in considering' their chemical nature, and the system of improvement. Thus a sandy soil may sometimes owe its fertility to the power of the subsoil to retain water ; and an absorbent clayey soil may occasionally be prevented from being barren, in a moist climate, by the influence of a substratum of sand...
Seite 174 - The principle, then, of this invention consists in forming a boiler by means of a system, or combination of a number of small vessels, instead of using, as in the usual mode, one large one ; the relative strength of the materials of which these vessels are composed increasing in proportion to the diminution of capacity.
Seite 159 - Hackett of the parish of St. Paul, Covent Garden, in the County of Middlesex, Perukemaker, and James Guthrie of the parish of St.
Seite 256 - For a method of separating the impurities from crude or cast iron without fusing or melting it, and of rendering the same malleable and proper for several purposes for which forged or rolled iron is now used ; and also by the same method of improving articles manufactured of cast iron, and thereby rendering cast or crude iron applicable to a variety of new and useful purposes.
Seite 116 - The precipitate that falls down is carbonate of lime ; it must be collected on the filter, and dried at a heat below that of redness. The remaining fluid must be boiled for a quarter of an hour, when the magnesia, if any exist, will be precipitated from it, combined with carbonic acid, and its quantity is to be ascertained in the same manner as that of the carbonate of lime. If any minute proportion of alumina should, from peculiar circumstances, be dissolved by the acid, it will be found in the...
Seite 111 - The specific gravity of a soil, or the relation of its weight to that of water, may be ascertained by introducing into a phial, which will contain a known quantity of water, equal volumes of water and of soil ; and this may be easily done by pouring in water till it is half full, and then adding the soil till the fluid rises to the mouth ; the difference between the weight of the soil and that of the water will give the result...
Seite 179 - The general indication of fertility and barrenness, as found by chemical experiments, must necessarily differ in different climates, and under different circumstances. The power of soils to absorb moisture, a principle essential to their productiveness, ought to be much greater in warm and dry countries, than in cold and moist ones ; and the quantity of fine aluminous earth they contain, should be larger.

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