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 . ° * is the same thing, so that the orificeof one end be lower than that of the other; then the equilibriumis destroyed, and the water will all descend out by thelower end,t, and rise up in the higher. For, the air pressing equally,but the two ends weighing unequally, a motion must com-mence where the power is greatest, and so continue till allthe water has run out
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 . ° * is the same thing, so that the orificeof one end be lower than that of the other; then the equilibriumis destroyed, and the water will all descend out by thelower end,t, and rise up in the higher. For, the air pressing equally,but the two ends weighing unequally, a motion must com-mence where the power is greatest, and so continue till allthe water has run out by the lower end. And if the shorterleg be immersed into a vessel of liquid, and the Syphon beset running as above, it will continue to run until all the waterbe exhausted, or, at least, as low as that end of the it may be made to run without first filling the Syphon, asabove described, by only inverting it, with its shorter leg inthe liquid; then with the mouth applied to the lower ori-fice, t, sucking the air out, when the fluid will presentlyfollow, being forced up into the Syphon by the pressure ofthe air on the water in the vessel. It must, however, behere stated, that the operation of this instrument does not. $4. FARIAS MEDICAL CfitMISTRYi depend upon the actual length of its legs being unequal, butupon the virtual or effective legs being so, and the effective legsare from the surface of the fluid to the bend or point s, andfrom thence to the extreme point of discharge at t; conse-quently, if the leg s r were to be made indefinitely longerthan s t, the Syphon would nevertheless run, provided thefluid at r was higher than the end t; but it would only con-tinue to run until the surface of that fluid should be depresseddown to the level of the point t, when it would stop. Theaction of the Syphon, then, is simply as follows; drawing theair out of the end t produces a vacuum in the tube ; the pres-sure of the atmosphere on the surface of the water r thereforecauses
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Keywords: ., bookcentury1800, booksubjectchemistrypharmaceutica, bookyear1825
