A Journal of Natural Philosophy, Chemistry and the Arts, 23-24. kötet |
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12. oldal
... experiments before us we may observe , that sand with rags produced a cabbage of two ounces , and four strong years of wheat . In clay with rags our cabbage weighed four ounces , and we had twelve strong years of wheat , But in what ...
... experiments before us we may observe , that sand with rags produced a cabbage of two ounces , and four strong years of wheat . In clay with rags our cabbage weighed four ounces , and we had twelve strong years of wheat , But in what ...
29. oldal
... Experiments season , and the reputed scarcity of bread corn , induced me in drying them . a few weeks since to make some small experiments on the means of drying potatoes , either in substance or in flour ; either for future consumption ...
... Experiments season , and the reputed scarcity of bread corn , induced me in drying them . a few weeks since to make some small experiments on the means of drying potatoes , either in substance or in flour ; either for future consumption ...
57. oldal
... Experiments will be pur to my exertions , I shall feel bound to proceed , and to en- sued . deavour to bring the experiments to a regular system . The glasses I used for determining the quantity of evaporation were of a bell form , and ...
... Experiments will be pur to my exertions , I shall feel bound to proceed , and to en- sued . deavour to bring the experiments to a regular system . The glasses I used for determining the quantity of evaporation were of a bell form , and ...
58. oldal
... experiments on the quantity of evaporation pro- duced from different soils , agreeing with me , that the greater or less degree of it influences most materially the luxuriance or growth of the crop . . In all the valuable tracts which ...
... experiments on the quantity of evaporation pro- duced from different soils , agreeing with me , that the greater or less degree of it influences most materially the luxuriance or growth of the crop . . In all the valuable tracts which ...
62. oldal
William Nicholson. * IX . Electrical Experiments on Glass considered as a Leyden Phial , and on coated Panes ; by Mr. CHANCE Experiments CE having thrown in my way two papers written militate against the doctrine of in Dutch by Mr. Lugt ...
William Nicholson. * IX . Electrical Experiments on Glass considered as a Leyden Phial , and on coated Panes ; by Mr. CHANCE Experiments CE having thrown in my way two papers written militate against the doctrine of in Dutch by Mr. Lugt ...
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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.