A Journal of Natural Philosophy, Chemistry and the Arts, Tom 35 |
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Popularne fragmenty
Strona 281 - Experimental Researches concerning the Philosophy of Permanent Colours, and the best means of producing them by Dyeing, Calico Printing, &,c.
Strona 182 - The water discharged by it; falls immediately into a stone trough ; in the front of which are two holes near the bottom ; these are the outlets of two streams, that flow constantly from the artificial cistern. An oblong notch is also cut in the same side of the trough ; which extends from the brim of it, nearly to the level of the two holes already mentioned. This aperture is intended to shew the fluctuations of the well ; for the water subsides in it when...
Strona 189 - ... have been made on Mr. Swainston's accidental discovery, render an elaborate inquiry into the constitution of Giggleswick Well unnecessary. Nature may be easily supposed to have produced an apparatus in the side of the hill, possessing the mechanical properties of the reciprocating tub, and all the phenomena will follow ; which are so remarkable in this fountain. Let us imagine a reservoir to be concealed from view under the rocks ; into which the stream of a subterranean brook falls, and beats...
Strona 182 - ... take for his standard of comparison. The rise of the water in the cistern, during the time of the well's flowing, is also equally uncertain ; for it varies from one inch, to nine or ten inches, in the course of a few reciprocations.
Strona 184 - I have endeavoured to confine the estahlished theory of reciprocation to one or two springs at most, a new explanation will be offered on my part, comprehending the phenomena of those wells, which ebb and flow according to no certain rule. Before I make this attempt, it will be proper to give a more circumstantial account of the appearances exhibited by the well at Giggleswick, than has hitherto been published. I neglected, when in the country, to preserve a correct register of its fluctuations,...
Strona 187 - ... upon which the water will begin to subside in the tub; and it will continue to do so, until the surface arrives at its proper level; unless a second collection of air happens to be formed in the mean time. We have now, investigated the nature of the reciprocation, observable in Mr. Swainston's apparatus, it proceeds entirely from the obstruction of air bubbles, lodged in the crooked canal; the formation of which depends on causes that act in a fortuitous or irregular manner; consequently the...
Strona 219 - ... the inequalities of the bottom of the sea must tend very greatly to increase the resistance, especially that part of it which varies as the square of the velocity. Now it may be demonstrated, that a resistance, simply proportional to the velocity, would not disturb the perfect regularity of the oscillations concerned, and that it would only retard them when direct, and accelerate them when inverted, by the time corresponding to an arc of which the sine is to...
Strona 185 - Westphalia, appears to require the agency of a siphon to account for its operations. The characters as ascribed to Pliny's Well, and the well in Dodona, are very ambiguous and unsatisfactory : but the operations of the three remaining springs, and more especially the register of Giggleswick Well, perplex the hypothesis of a siphon with insuperable difficulties; which a superficial inspection of the table will discover to the reader. The theory, which I shall now propose for the explanation of irregular...
Strona 173 - Month. 1. The maximum of temperature, at 9 am wet. 2. Cloudy am In the afternoon the sky cleared pretty suddenly, save that some dense cumulus clouds remained in the NE to the summit of one of which a cirrostralus was observed for a considerable time adhering, which was at length incorporated with the larger cloud.
Strona 258 - ... to the second; the second to the third; the third to the fourth; and so on : Silver, Copper, Iron, Tin, Lead, Zinc.