A Journal of Natural Philosophy, Chemistry and the Arts, 第 1-2 卷 |
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熱門章節
第 269 頁 - When foul weather happens soon after the falling of the mercury, expect but little of it ; and, on the contrary, expect but little fair weather, when it proves fair shortly after the mercury has risen.
第 79 頁 - And do not hot bodies communicate their heat to contiguous cold ones by the vibrations of this medium, propagated from them into the cold ones ? And is not this medium exceedingly more rare and subtile than the air, and exceedingly more elastic and active ? And doth it not readily pervade all bodies? And is it not, by its elastic force, expanded through all the heavens?
第 160 頁 - Q, so that it cannot slip. The leaden pieces D and E are cast in their places, and have no packing whatever. They move very easily ; and if at any time they should become loose, they may be spread out by a few blows with a proper instrument, without taking them out of their place. On the...
第 248 頁 - ... yards from each other. What he further learnt from the inhabitants of the village, concerning the phenomenon, was, that about eight o'clock in the evening, when retired to their habitations, they observed a very bright light, proceeding as from the sky, accompanied with a loud clap of thunder, which was immediately followed by the noise of heavy bodies falling in the vicinity. Uncertain whether...
第 63 頁 - I beg leave to add further, that on making inquiries of two children, between seven and eight years of age, now under my care, both of whom have been blind from birth, and on whom no operation has yet been performed, I find that the knowledge they have of colours, limited as it is, is sufficient to enable them to tell whether coloured objects be brought nearer to, or carried...
第 42 頁 - ... becomes of a deep olive brown, and when the impregnation is completed, it appears opaque, and almost black. The process is apparently owing to a simple elective attraction ; in no...
第 80 頁 - These seem to be most plain, genuine, and necessary conditions of this hypothesis. And they agree so justly with my theory, that if the animadversor think fit to apply them, he need not, on that account, apprehend a divorce fro'm it. But yet, how he will defend it from other difficulties, I know not.
第 80 頁 - Considering the lastingness of the motions excited in the bottom of the eye by light, are they not of a vibrating nature? Do not the most refrangible rays excite the shortest vibrations, the least refrangible the largest? May not the harmony and discord of...
第 160 頁 - ... which it oversets by the acquired motion of the weight L. The mere rise of the piston, if there were no additional motion in the tumbler, would only bring the two plugs D and E to the position of rest, namely, to close G and F, and then the engine would stop ; but the fall of the tumbler carries the plug D downwards, quite clear of the hole F, and the other plug E upwards, quite clear of the hole G. These motions require no consumption of power, because the plugs are in equilibrio, as was just...
第 198 頁 - A spiral wire, in the form of a reversed cone, to regulate ihe delivery of them. ... < c. An inclined iron plate, hung upon a pin on its higher end : the lower end rests on the grooved axis D, and agitates the wire B. D. The grooved axis, or grinding cylinder, which ads against the channelled iron plate E. F.