The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1844 |
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مقاطع مشهورة
الصفحة 338 - Gardner on this point : — •• We know, both from the observations of Ingenhousz and Sennebier, as well as from daily experience, that the absence of solar light is one of the conditions almost necessary for the germination of seed, and consequently we should not expect that ray in which the maximum of light is found to facilitate germination, but on the contrary, as in Mr. Hunt's experiments to retard it " This, however, is not the only objection to which this statement is liable, for if the...
الصفحة 106 - Now the force or energy of the wave, which, expressed with reference to sensation, means the intensity of the light, is proportional to the square of the amplitude. Hence the amplitude being one-hundredfold, the energy of the largest light-giving waves would be ten-thousandfold that of the smallest.
الصفحة 55 - The turbine wheel, for example, acts on the principle of reaction, according to Newton's third law of motion that action and reaction are equal and opposite.
الصفحة 51 - Dr. Priestley was one of the earliest to notice the fact: it naturally struck him with surprise, that two elastic fluids, having apparently no affinity for each other, should not arrange themselves according to their specific gravities, as liquids do in like circumstances. Though he found this was not the case after the elastic fluids had once been thoroughly mixed, yet he suggests it as probable, that if two of such fluids could be exposed to each other without agitation, the one specifically heavier...
الصفحة 149 - I refer, which will in due time appear in the work cited. The rule adopted in this country for finding Easter is that of the Roman Catholic Church, as established at what is called the reformation of the Calendar by Pope Gregory XIII. in 1582. The authority for this rule is contained in the papal brief of March 1st, 1582, in which reference is made, for all explanations, to the then forthcoming work of the Jesuit Clavius, to whom both the adjustment and explanation of the Calendar had been intrusted.
الصفحة 218 - By H. Warburton, Esq., MP, FRS, Pres. GS The bed described does not form a continuous stratum, but occurs with interruptions and intervals in the condition of Septaria, which contain remains of shells of the genera Paludina and Unlo.
الصفحة 51 - On the constitution of mixed elastic fluids When two or more elastic fluids, whose particles do not unite chemically upon mixture, are brought together, one measure of each, they occupy the space of two measures, but become uniformly diffused through each other, and remain so, whatever may be their specific gravities. The fact admits of no doubt; but explanations have been given in various ways, and none of them completely satisfactory. As the subject is one of primary importance in forming a system...
الصفحة 296 - The theory assumes, that the particles of the dielectric (now an electrolyte) are in the first instance brought, by ordinary inductive action, into a polarized state, and raised to a certain degree of tension or intensity before discharge commences; the inductive state being, in fact, a necessary preliminary to discharge.
الصفحة 161 - And being struck with the great quantities of gas which they afforded, as well as with the brilliancy of the light, and the facility of its production, I instituted several experiments with a view of ascertaining the cost at which it might be obtained, compared with that of equal quantities of light yielded by oils and tallow.
الصفحة 299 - ... action (18. 19.). 4th. That when the circuit is completed, whether by actual contact of the terminals, or merely by approximating them, so as to allow a succession of sparks, the dynamic effects on the galvanometer are the same (30.) ; each producing a steady deflection of the needle ; consequently that the current, even when the circuit is closed, may be regarded as a series of discharges of electricity of tension, succeeding each other with infinite rapidity. 5th. That the rise of tension in...