Chemical Technology; Or, Chemistry in Its Applications to the Arts and Manufactures, Band 1,Teil 2


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Seite 203 - England it is customary to define a heat unit as the quantity of heat that is required to raise the temperature of a pound of water 1° on the Fahrenheit scale.
Seite 253 - ... of energy of the heat communicated ; and that a corresponding machine, or the same machine worked backwards, may be employed to produce cooling effects requiring about the same expenditure of energy in working it to cool the same substance through a similar range of temperature. When a body is heated by such means about...
Seite 212 - ... the temperature of 212° F. under any circumstances. The sides and top of the stove are thus converted into a hot chamber, offering an extensive surface of heated metal ; at the bottom, by an opening in the ornamental part, the air is allowed to enter, and rises as it becomes warmed, traversing in its ascent the different compartments formed by the hot parallel plates, and is allowed to escape at the top by some similar opening into the room.
Seite 392 - Report of the Exploring Expedition to the Rocky Mountains in 1842, and to Oregon and North California in 1843-44.
Seite 392 - New Varieties of Gold and Silver Coins, Counterfeit Coins and Bullion, with Mint Values.
Seite 91 - ... completed, as is the case in charcoal from heaps, in order to obtain the desired result. Berthier pointed out this fact some years back, and it has now been proved in a series of interesting experiments by Sauvages. He charred in the same furnace, one after the other, 5 equal parts of air-dried wood, and interrupted the process each time at a different interval, in order to examine the products of the various degrees of carbonization as to their loss of weight and bulk, and their amount of combustible...
Seite 98 - The nature (age) of the peat, its consequent density, &c., must direct the burner. A mound, of the circumference stated, produced from not quite air-dried peat, 24 per cent. of the weight and 27 of the bulk ; from air-dried, 27 per cent. in weight and 32£ in volume ; from freshly dug Pfungstadt peat, 30 per cent. in weight and 29 in bulk ; from excellent peat, quite dry, 35£ of the weight and 49 per cent. of the bulk. In the district of Siegen very good peat produced 23 per cent, of the weight...
Seite 393 - American Genealogy ; being a History of some of the Early Settlers of North America and their Descendants, from their First Emigration to the Present Time, with their Intermarriages and Collateral Branches ; including notices of Prominent Families and Distinguished Individuals ; with Anecdotes, Traditions, Sketches of the Founding of Cities, Villages, Manors, and Progressive Improvements of the Country, from its wilderness state to the present era, illustrated by Genealogical Tables, by Jerome B.
Seite 41 - Coal occurs in almost every principal subdivision of Spain, but we have only included the Asturias region. Hence, as regards European countries, Great Britain takes the first rank : Belgium, as regards territorial proportion, occupies the second rank, although in relative coal area she is the least of the four. Pennsylvania, in respect of territorial proportion, is higher than any of these, being relatively...
Seite 323 - ... should be concealed. 4. It should possess considerable cohesion of its particles, so that it may not be broken into too small fragments by the constant attrition which it may experience in the vessel. 5. It should combine a considerable density with such mechanical structure that it may easily be...

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