The Technical repository, by T. Gill, Volume 9Thomas Gill (patent-agent) 1826 |
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advantage appear asphaltum attention basket bason bellows black mulberry boiling brush-wood clean climate cloves cocoons colour common consequence considerable costive Count Dandolo crop cultivation curl cylinder degree disease drills edge effect eggs employed equal evaporation experiments favour feet fire forceps four Fourth Age furnace garden glass grains ground heat holes hygrometer improved inches iron latter leaves machine manner Manufactures manure means ment of Arts method moisture Montauban mulberry trees nearly observed ounces piece pipe plants plate potatoes pounds pounds weight prevent produced proper purpose quantity Quercy razor reel screw scrofula second age seed side silk silk-worms six months Society soil steam steel stem Stourbridge sufficient surface Tech Technical Repository temperature thick thread tion vegetable weight wheel white mulberry WHITLAW wind wood worms Zealand Flax
Popular passages
Page 165 - Wells, in the pride of half knowledge, smiled at the means frequently employed by gardeners, to protect tender plants from cold, as it appeared to me impossible, that a thin mat, or any such flimsy substance, could prevent them from attaining the temperature of the atmosphere, by which alone I thought them liable to be injured. But, when I had learned, that bodies on the surface of the earth become, during a still and serene night, colder than the atmosphere, by radiating their heat to the heavens,...
Page 165 - Evaporation increases in a prodigiously rapid ratio with the velocity of the wind, and anything which retards the motion of the latter is very efficacious in diminishing the amount of the former : the same surface which, in a calm state of the air, would exhale 100 parts of moisture, would yield 125 in a moderate breeze, and 150 in a high wind.
Page 164 - ... as the elasticity of vapour at the temperature of the air is to the elasticity of vapour at the temperature of the dew-point, so is the term of saturation to the observed degree of moisture. Thus, with regard to the observation in the Deccan...
Page 62 - Middlesex; who, in consequence of a communication made to him by a certain foreigner residing abroad, is in possession of certain improved Machinery for breaking or preparing Hemp, Flax, and other Fibrous Materials.
Page 156 - ... they are regularly exposed to moisture, until they are sufficiently prepared for welding. Being cut into lengths of about twelve inches, they are formed into a pile an inch or an inch and a half high, laying the edges straight, so as not to overlap each other : a longer piece is then so fitted as to return over each end, and hold the whole together in the fire. This pile is then heated...
Page 266 - The chill which is instantaneously communicated to the glass by a fall of rain and snow, and the consequent evaporation from its surface, must also precipitate the internal vapour, and dry the included air to a very considerable amount, and the effect should be closely watched.
Page 266 - ... or a degree of saturation not exceeding 528. To this, in a clear night, we may add at least 6° for the effects of radiation, to which the glass is particularly exposed, which would reduce the saturation to 434°, and this is a degree of drought which must be nearly destructive. It will be allowed that the case which I have selected is by no means extreme, and it is one which is liable to occur even in the summer months. Now by an external covering of mats, &c. the effects of radiation would...
Page 157 - The barrel is then forged in the usual way, but much more jumping is used than in the English method, in order to render the twist finer. The most careful workmen always make a practice of covering the part exposed to the fire with a lute, composed of mud, clay, and the dung of cows or horses, in order to guard against any unnecessary oxydation of the metal.
Page 264 - ... which are provided for the preservation of the shoots in the winter season. Some idea may be formed of the prodigiously increased drain upon the functions of a plant arising from an increase of dryness in the air from the following consideration. If we suppose the amount of its perspiration, in a given time, to be 57 grains, the temperature of the air being...
Page 144 - ... glass rods to prevent the injuries of friction. The first portions are necessarily useless, and are separated by the hand. When the threads came off uniformly, the cocoons were raised suspended to the hand by their respective threads, and thus handed over to those on the opposite side, who, in their turn...