Philosophical Transactions, Volume 171, Part 1 (Google eBook)

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C. Davis, Printer to the Royal Society of London, 1880 - Science
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Page 390 - ... will also vary, tending to luxuriance, or to maturation, that is, to quantity, or to quality, as the case may be. Hence, only a very detailed consideration of climatic statistics, taken together with careful periodic observations in the field, can afford a really clear perception of the connection between the ever-fluctuating characters of season and the equally fluctuating characters of growth and produce. It is, in fact, the distribution of the various elements making up the season, their mutual...
Page 204 - ... express, even in a comparatively complicated chemical equation, the nature of the metamorphosis which a gunpowder of average composition may be considered to undergo, when exploded in a confined space, would therefore only be calculated to convey an erroneous impression as to the simplicity, or the definite nature, of the chemical results and their uniformity under different conditions, while it would, in reality, possess no important bearing upon an elucidation of the theory of explosion of...
Page 396 - ... several degrees colder than the average, with about, or less than, the average amount of rain. Early in April warm weather set in, and lasted till nearly the end of the month, the temperature during this period being several degrees higher than the average, whilst the fall of rain was generally under the average. May and June were, with few exceptions, of short duration, very much colder than the average. Towards the end of May the cold was very extreme for the season, and the greater part of...
Page 109 - ... distances, while with a constant potential and various distances, the pressure has to be diminished in a greater ratio than that of the increase of distance in order to permit a ' discharge to take place. 6. The electric arc and the stratified discharge in vacuum tubes are modifications of the same phenomenon.
Page 396 - November were throughout, with very few exceptions, colder than usual, both day and night ; whilst in October there was a deficiency of rain, and in November a very great deficiency. December, on the other hand, was almost throughout very much warmer than the average, with a very great excess of rain, some violent gales of wind, very variable, but, upon the whole, very low barometric pressures, and high degree of humidity of the atmosphere. The average temperature of December had, indeed, been exceeded...
Page 362 - ... of the plants which are variable, and those which remain constant. Thus also we will attain a knowledge of the quantities of all the constituents removed from the soil by different crops. " The farmer will thus be enabled, like a systematic...
Page 290 - ... About seven acres in the park at Rothamsted have been set apart for the experiments, and divided into plots. Two of these have been left without manure from the commencement ; two have received ordinary farm-yard manure, whilst the remainder have each received a different description of artifical or chemical manure, the same being, except in special cases, applied year after year on the same plot. Referring first to the Agricultural Results, it may be premised that, without manure, the produce...
Page 240 - ... in the projectile. But it rarely happens, especially with the very large charges used in the most recent guns, that gravimetric densities so high as unity are employed, and in such cases, from the total realisable energy must be deducted the energy which the powder would have generated had it expanded from a density of unity to that actually occupied by the charge. Thus, in the instance above given, if we suppose the charge instead of a gravimetric density of unity to have a gravimetric density...
Page 291 - ... years of the experiments ; and on several other occasions partial separations have been undertaken. The character and tendency of the results so obtained may be very briefly indicated as follows : In the produce grown continuously without manure the average number of species found has been 49. Of these, 17 are grasses, 4 belong to the order Leguminosae, and 28 to other orders.
Page 17 - ... determinations of metal-metal, metal-liquid, and liquid-liquid potential differences. The principle of their method was as follows: "Let 3 and 4 be two insulated gilt brass plates connected with the electrodes of a delicate quadrant electrometer. Let 1 under 3 and 2 under 4 be the surfaces whose contact potential is to be measured. 3 and 4 are first connected together and then insulated, but remain connected to their respective electrometer quadrants. Now 1 and 2 are made to change places with...

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