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Page 383 - If organic matter is everywhere, the presence of ammonia is everywhere possible ; and if that matter is decomposing, ammonia is everywhere. That is the general statement which this paper illustrates. It is now many years since it was observed by me that organic matter could be found on surfaces exposed to exhalations from human beings ; but it is not till now that the full significance of the fact has shone on me, and the practical results that may be drawn from it in hygiene and meteorology. These...
Page 8 - To lessen this the bulbs were first made with black glass ; moreover, originally the degree marks were put upon the supporting slab, then they were put upon the tubes of the thermometers. It was then found that in a position where two thermometers with similarly coated bulbs were exposed to the sun, but one was exposed to more wind than the other, the indicated temperatures varied greatly. To avoid this it was proposed that the thermometer should be inserted in a glass shield exhausted of air. Various...
Page 152 - Taking only this difference in surface temperature as an index of the heat accumulated there, a simple calculation will show that the quantity of specific heat daily carried off by the Gulf Stream from those regions, and discharged over the Atlantic, is sufficient to raise mountains of iron from zero to the melting point, and to keep in flow from them a molten stream of metal greater in volume than the waters daily discharged from the Mississippi River.
Page 162 - A few meteorological observations made on a voyage up the Nile in February and March, 1885," by Dr. W. Marcet, FRS The author on a voyage up the Nile from Cairo to Assouan made a series of meteorological observations, and in the present paper gives the results of those relating mainly to nocturnal radiation and the temperature of the water of the Nile. (2.) "The Mean Direction of Cirrus Clouds over Europe,
Page 32 - ... in the annulus, and increase the velocity of the wind at the surface of the earth, towards the centre of the ascending column, while all round on the outside of the annulus there will be a gentle wind outwards. Any general currents of air, which may exist at the time, will of course modify these motions, from the oblique forces they would occasion. The up-moving current of air must of course be entirely supplied by...
Page 398 - The sunlight, which is admitted into the box by two small apertures, acts on the paper and, travelling over it by reason of the Earth's rotation, leaves a distinct trace of chemical action.
Page 118 - It does not appear from existing records that there is any diminution in the water-supply of this country, and the large quantity of water which has been stored or has flowed off the ground between 1876 and 1884 is confirmatory of this view. There appear, however, to be periods when there is exceptionally low water, and these are almost immediately followed by periods of exceptionally high water. With reference to the increase of floods, it does not appear from the records that there is any great...
Page 8 - Subsequently, owing to the influence of the lower temperature of the unblackened thermometer tube, about one inch of it was coated like the bulb. As evidence of the degree of exhaustion, a small mercurial pressure gauge was attached to the thermometer, and by other makers platinum wires were soldered through the shield so that the stratification of the electric arc might indicate the amount of air still left.
Page 9 - Leach's shields, and many attempts have been made to render the joint at the entrance of the tube water-tight. This is not easy, because the thermometer is exposed to a great range of temperature, and the air inside the shield varies so much in volume that it forces its way through almost every joint. The object is, however, effected when the external jacket is sealed on the stem near the bulb.