The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . pressure of theatmosphere for its action, the bend s at its top must in no caseexceed 33 feet from the surface of the water to be raised, orit will be incapable of acting.* 119. The ordinary form, and mode of using the Syphon, orCrane as it is called in commercial language, are shown in theannexed figure. * A column of mercury 31 inches high is a balance for, or is
The elements of medical chemistry : embracing only those branches of chemical science which are calculated to illustrate or explain the different objects of medicine, and to furnish a chemical grammar to the author's Pharmacologia . pressure of theatmosphere for its action, the bend s at its top must in no caseexceed 33 feet from the surface of the water to be raised, orit will be incapable of acting.* 119. The ordinary form, and mode of using the Syphon, orCrane as it is called in commercial language, are shown in theannexed figure. * A column of mercury 31 inches high is a balance for, or is the great-est height of, that metal which the pressure of the atmosphere can sustainwhen at its greatest natural density, and as this density diminishes it cansometimes support no more than 28 inches of mercury in the barometer as the specific gravity of mercury is 13*56, or rather more than 13times and a half as heavy as water, it follows that, if the pressure of the at-mosphere can support 31 inches of the former, it will also support above 13times and a half as high a column of the latter, or one of about 420 inches,or 35 feet in perpendicular height. (MiUingtoris Natural Philosophy.) PARIS S MEDICAL The inconvenience of applyingthe mouth to the extremity of theleg is prevented by the supple-mentary tube h. The instrumentis supported by means of the per-forated board /, at the properdepth in the vessel e. 120. A. very simple and useful application of the principle upon which the Syphon operates, may t^S^P be made by means of strips of linen A~7\\\ rag> or skeins of cotton, wetted and ^—. J hung over the side of the vessel containing a fluid, in such a manner as that one end of therag or cotton may be immersed in the liquid, and the other endmay remain without, below the surface. 121. Filtration. An operation, by means of which a fluidis mechanically separated from consistent particles merelymixed with it. It does not differ from Straining, exceptpe
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