The London, Edinburgh and Dublin philosophical magazine and journal of science . ems are im-mensely complicated when, instead of our single variable x,there are several variables; but that these additional difficultieshave been triumphed over by a long line of distinguishedmathematicians, from Laplace to Glaisher. LI. Description of an Apparatus to illustrate the Productionof Work by Diffusion. By C. J. Woodwaed, * DIFFUSION, as a source of energy, is usually shown inthe lecture-room by bringing a jar of hydrogen over aporous vessel fitted up with a glass tube dipping into ,
The London, Edinburgh and Dublin philosophical magazine and journal of science . ems are im-mensely complicated when, instead of our single variable x,there are several variables; but that these additional difficultieshave been triumphed over by a long line of distinguishedmathematicians, from Laplace to Glaisher. LI. Description of an Apparatus to illustrate the Productionof Work by Diffusion. By C. J. Woodwaed, * DIFFUSION, as a source of energy, is usually shown inthe lecture-room by bringing a jar of hydrogen over aporous vessel fitted up with a glass tube dipping into , by inward diffusion, enters the jar; the internalpressure thus produced forces the water down, and a stream ofbubbles escapes from the tube. On removing now the jar ofhydrogen, outward diffusion of the hydrogen takes place, aminus pressure is produced in the porous vessel, and the wateris lifted. The apparatus I am about to describe is an adaptation of thisexperiment to the production of an oscillatory movement of abeam from alternate inward and outward diffusion of -*% The apparatus is represented in the annexed figure. A Ais a scale-beam about 3 feet long, carrying at one end a scale- * Communicated by the Physical Society, having been read at theMeeting on May 12th, 18S3. 376 Apparatus to illustrate Work hy Diffusion. pan and counterpoise, B, and at the other the porous jar, C,fitted with a cork, and a glass tube c which dips into a gas-jarD containing water or methylated spirit. Three or four glassjets, of which one is shown at E, are supported in a horizontalposition, and the opening of each jet is placed as near as pos-sible to the porous vessel without touching it during the oscil-lations of the beam. These jets are connected by means of aflexible tube with a gas-holder containing hydrogen; the bell ofthe holder being loaded so as to force the hydrogen in a gentlestream against the sides of the porous vessel. The best positionfor the jets is found by trial; bu
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
