. Annals of Philosophy. 1823.] Prof. Oersted on the Compressibility of Water. 55 cooling, will partly sink into the capillary tube f, as deep as the mark, g, and separate the water in the flask from that in the outer vessel. This flask is now placed into a strong cylinder of glass A B C D, upon which another smal- lercylinder of brass EFGH is fixed. A piston con- nected with a screw F is moveable in this upper cy- linder. If a pressure by means of this piston be exerted upon the water in the glass cylinder, this will press upon the mer- cury, and thus upon the water in the flask. As soon as th
. Annals of Philosophy. 1823.] Prof. Oersted on the Compressibility of Water. 55 cooling, will partly sink into the capillary tube f, as deep as the mark, g, and separate the water in the flask from that in the outer vessel. This flask is now placed into a strong cylinder of glass A B C D, upon which another smal- lercylinder of brass EFGH is fixed. A piston con- nected with a screw F is moveable in this upper cy- linder. If a pressure by means of this piston be exerted upon the water in the glass cylinder, this will press upon the mer- cury, and thus upon the water in the flask. As soon as the water in the flask is compressed, the mercury in the capillary tube will sink; and the least pressure produces that effect. To mea- sure the compression, the author fastens the flask in a cylinder of lead d, which bears a scale on which one-fourth part of a French line is marked, and a small glass tube, e f, filled with air, evenly bored, serves to mea- sure the compressing power by the compression of the air. All changes of temperature are easily perceived on the narrow neck of the flask much more accurately than on any thermometer ; for an increase of temper- ature amounting to one degree (centigrade) makes the water rise 27 lines, its temperature supposed to be about 15°. If the tem- perature is considerably higher or lower, the changes of course will be either greater or smaller. The scale being divided into one-fourth part of a line, and one-eighth being easily perceived by the eye, it is evident that -j-g-g0 cannot escape observation, and that ^i? is by no means difficult to observe. It is scarcely necessary to add, that the temperature of the liquid is to be ascertained by a thermometer, at the beginning of the expe- riment. If the experiment be made cmickly, and no per-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resembl
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