Annual of Scientific Discovery: Or, Year-book of Facts in Science and Art


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354 페이지 - The caterpillars, when full grown and well fed, are 16-legged, of the size of a common crow quill, and from an inch and a quarter to an inch and a half in length.
214 페이지 - A Verb Passive expresses a passion or a suffering, or the receiving of an action ; and necessarily implies an object acted upon, and an agent by which it is acted upon : as, to be loved ;
268 페이지 - The author then instituted experiments to test this method. From these it appeared that distilled water to which a known quantity of ammonia had been added, furnished more ammonia than had been mixed with it ; so that, apparently, all distilled water contains ammonia. The water employed in the following experiments was distilled first with sulphate of alumina, and afterwards over potash, to remove any ammonia and carbonic acid that might be contained in it. In the following table the first column...
136 페이지 - But the most valuable effect of this test-apparatus (which was afterwards made more perfect and independent of the table) is the corrective power it possesses over the mind of the table-turner. As soon as the index is placed before the most earnest, and they perceive — as in my presence they have always done — that it tells truly whether they are pressing downwards only or obliquely, then all effects of table-turning cease, even though the parties persevere, earnestly desiring motion, till they...
81 페이지 - Metropolis (although a Steam Engine be not used or employed therein), shall in all cases be constructed or altered so as to consume or burn the Smoke...
59 페이지 - ... in which c, was the maximum economical evaporation in feet of water per foot of grate per hour; h, was the total heating surface in square feet, measured inside; and g, was the gratearea in square feet:— A 2 c= •00222— 9 From this it followed :—1st.
133 페이지 - Then, the table turner placed the hands upon the upper card, and we waited for the result. Now, the cement was strong enough to offer considerable resistance to mechanical motion, and also to retain the cards in any new position which they might acquire — and yet weak enough to give way slowly to a continued force.
295 페이지 - This extensive belt of woodland, which forms one of the most prominent and anomalous features upon the face of the country, is from five to thirty miles wide, and extends from the Arkansas river in a southwesterly direction to the Brazos, some four hundred miles.
312 페이지 - Great care was taken in the endeavor to bring the plummet again to the surface to show the nature of the bottom, but, whilst carefully reeling in, the line broke at 140 fathoms below the water-line, carrying away a Six's thermometer which had been bent on at 3000 fathoms.
213 페이지 - ... is afterwards removed by the sulphuric acid. The vacuum thus obtained is so perfect, that even after two operations it exercises no appreciable tension. To give a clear conception of the progress of the absorption, I will describe in detail one observation in which the tension was measured simultaneously by a good...

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