A Journal of Natural Philosophy, Chemistry and the Arts, 23-24. kötet |
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35. oldal
... tion . Nor will this errour be considered as without excuse , when the great resemblance of many of these substances to terrestrial fruits is shewn . Indeed , I much suspect that , after all the circumstances have been examined , some ...
... tion . Nor will this errour be considered as without excuse , when the great resemblance of many of these substances to terrestrial fruits is shewn . Indeed , I much suspect that , after all the circumstances have been examined , some ...
37. oldal
... tion shews that , unlike to the parenchyma of fruits , which from that of is formed of vessels terminating in minute points , the sub- stance of these bodies is formed of a species of net - work , which , as M. Guettard observes , if ...
... tion shews that , unlike to the parenchyma of fruits , which from that of is formed of vessels terminating in minute points , the sub- stance of these bodies is formed of a species of net - work , which , as M. Guettard observes , if ...
57. oldal
William Nicholson. tion from dung . absorption nor evaporation . One very important result is Great evapora placed before the eyes , and within the reach of every ... tion greatly in , £ uences IMPROVEMENTS IN THE CULTURE OF VEGETABLES . 57.
William Nicholson. tion from dung . absorption nor evaporation . One very important result is Great evapora placed before the eyes , and within the reach of every ... tion greatly in , £ uences IMPROVEMENTS IN THE CULTURE OF VEGETABLES . 57.
124. oldal
... tion have of late used very hard chalk , and with great suc- cess . On all moors , peat bogs , and peat fens , every species of calcareous earth may be applied with singularly good effect ; and as chalk abounds more than marle in this ...
... tion have of late used very hard chalk , and with great suc- cess . On all moors , peat bogs , and peat fens , every species of calcareous earth may be applied with singularly good effect ; and as chalk abounds more than marle in this ...
167. oldal
... tion : but it requires so many drawings to give a perfect situation . idea of them , that of course such a work as yours could not adinit them . I once traced these vessels from the stem to the apple , and thence to the line in the seed ...
... tion : but it requires so many drawings to give a perfect situation . idea of them , that of course such a work as yours could not adinit them . I once traced these vessels from the stem to the apple , and thence to the line in the seed ...
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acre alcohol alcyonia alcyonium alkali ammonia animal appears ascertain ashes Barita bark barytes bodies boiling boracic boracic acid bottle burning bushels cabbages carbonic acid chalk charcoal clay colour common contain crops cubical inches decomposed decomposition Ditto Ditto dung effect electric equal evaporation experiments fibres flour fluid former fossil fruit germinating glass Glycina grains ground heat hemp hidrogen hygrometer insect insulated iron land leaf leaves lime Magnesia manure marle matter mercury metal method moisture muriatic acid nature nitric nitric acid northern diver observed obtained oxide oxigen gas pears peat pedicle phosphorus plants plough potash potassium potatoes precipitate present produced proportion quantity Rain residuum retort root sand seed Society soil species sponge Strontia suberic acid substance sulphate of barytes sulphuret sulphuric acid surface tained tion trees tube Upper Canada vegetable vessels vraic weight wheat
Népszerű szakaszok
167. oldal - The whole problem is confined within these limits, viz. To make a surface support a given weight by the application of power to the resistance of air.
168. oldal - I shall therefore take 23.6 feet as somewhat approaching the truth. Having ascertained this point, had our tables of angular resistance been complete, the size of the surface necessary for any given weight would easily have been determined. Theory, which gives the resistance of a surface opposed to the same current in different angles, to be as the squares of the sine of the angle of incidence, is of no use in this case ; as it appears from the experiments of the French Academy, that in acute angles,...
171. oldal - ... diminished, and consequently the propelling force, in the same ratio. In practice, the extra resistance of the car and other parts of the machine, which consume a considerable portion of power, will regulate the limits to which this principle, which is the true basis of aerial navigation, can be carried; and the perfect ease with which some birds are suspended in long horizontal flights, without one waft of their wings, encourages the idea, that a slight power only is necessary.
87. oldal - A gazometer, containing seven hundred -cubical feet of gas, weighs about twenty hundred weight, and costs about two pounds ten shillings the hundred weight. The whole of an apparatus complete, capable of supporting forty lamps for four hours, each lamp affording light equal to ten candles of eight in the pound, will cost about two hundred and fifty pounds. Each lamp consumes six cubical feet of gas per hour.
385. oldal - Lecture ; an Account of some new analytical Researches on the Nature of certain Bodies, particularly the Alkalies, Phosphorus, Sulphur, Carbonaceous Matter, and the Acids hitherto undecompounded ; with some general Observations on Chemical Theory.
167. oldal - Let ab be a section of the plane of both wings opposing the horizontal current of air (created by its own motion), which may be represented by the line cd, and is the measure of the velocity of the bird. The angle bdc can be increased at the will of the bird, and to preserve a perfectly horizontal path, without the wing being waved, must continually be increased in a complete ratio (useless at present to enter into) till the motion is stopped altogether; but at one given time the position of the...
13. oldal - VOLTAIC electricity, a dark coloured inflammable substance separating from it on the negative surface, In the course of the spring and summer, I made many attempts to collect quantities of this substance for minute examination. When boracic acid, moistened with water, was exposed between two surfaces of platina, acted on by the full power of the battery of five hundred, an olive-brown matter immediately began to form on the negative surface, which gradually increased in thickness, and at last appeared...
169. oldal - ... edge. This may or may not be the true theory, but it appears to me to be the most probable account of a phenomenon, which the flight of birds proves to exist. Six degrees was the most acute angle, the resistance of which was determined by the valuable experiments of the French Academy; and it gave T% of the resistance, which the same surface would have received from the same current when perpendicular to itself.
112. oldal - ... large cavern near Torquay in Devonshire, commonly known by the appellation of Kent's-hole, and where both species are usually observed in considerable abundance clinging to the vaulted roof of the interior apartments. This vast cavern was explored with a view to obtain whatever species of Vespertilio might inhabit it, and with expectation of procuring specimens of V. Barbastellus, and possibly some new species, having been informed the cave abounded in number and variety. Strange, however, as...
164. oldal - I feel perfectly confident, however, that this noble art will soon be brought home to man's general convenience, and that we shall be able to transport ourselves and families, and their goods and chattels, more securely by air than by water, and with a velocity of from 20 to 100 miles per hour.