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advantage agricultural amount apparatus appears applied attention better called carpets carried Charles clay colour communication considerable considered cost cultivation Dated deep depth desirable drainage drains effect employed engine examination Exhibition existing experience fact feet field furnace George give given glass hand Henry important Improvements increased Institution interest invention iron James John labour land lecture less light London machine machinery manufacture March material matter means measurement mechanical meeting ments nature necessary object observed obtained operation patent plants practical prepared present principle produce progress quantity question railway reference remarks resin respect result ship soap Society soil steam supply taken things Thomas tion tons trade various weight whole
Page 97 - for the purpose of taking such steps as may be necessary to render the patent system and the funds derived from inventors more efficient and available for the reward of meritorious inventors and the advancement of practical science.
Page 163 - certain mechanical means by which the conveyance of coals, minerals, and other articles is facilitated, and the expense attending the same rendered less than heretofore.
Page 30 - Bedouins visit all the trees in succession, and make a deep incision in each, pulling off a narrow strip of bark for about five inches below the wound. This is left for a month, when a fresh incision is made in the same place, but deeper. A third month elapses, and the operation is again repeated, after which the gum is supposed to have attained a proper degree of consistency. The mountain sides are immediately covered with parties of men and boys, who scrape off the large clear globules into one...
Page 90 - Another man receives the leaves as they are planed, and with his thumb-nail loosens and gathers the fibres about the middle of the leaf, which enables him by one effort to detach the whole of them from the outer skin. The fibres are next steeped in water for some time, after which they are washed, in order to free them from the matter that still adheres and binds them together.
Page 146 - I mix the fatty body to be operated upon with from a third to a half of its bulk of water, and the mixture may be placed in any convenient vessel in which it can be subjected to the action of heat, to a temperature about the same as that of melting lead until the operation is complete ; and the vessel must be closed, so that the requisite amount of pressure may be applied to prevent the conversion of the water into steam.
Page 163 - I soon relinquished the idea of constructing an engine upon this principle, from being sensible it would be liable to some of the objections against Savery's engine, viz. the danger of bursting the boiler, and the difficulty of making the joints tight, and also that a great part of the power of the steam would be lost, because no vacuum was formed to assist the descent of the piston.
Page 128 - ... the whole internal capacity, including all those parts of a vessel which, being under cover of permanent decks, are available for stowage.
Page 128 - ... above or below the main wales, exclusive of all manner of doubling planks that may be wrought upon the sides of the ship ; then multiplying the length of the keel by the breadth so taken, and that product by half the breadth, and dividing the whole by ninety-four, the quotient shall be deemed the true contents of the tonnage.
Page 34 - Avas about one-quarter of the original weight, and with other fuel burns well. The coke of the leaf has a bright shining appearance, and when ground with oil, is a very good substitute for lamp-black in paint. The gas has a smell somewhat similar to coal gas, not nearly so offensive, but sufficiently strong to make any escape immediately perceptible.