. Laboratory exercises in elementary physics. fine. Apparatus for Atmospheric Pressure.—The barometer-tube is3 ft. long. The device for removing air-bubbles is a featherabout 2 in. long, cut down to ^ in. in width, fastened firmly bythread to the end of a straight, stiff iron wire 3£ ft. long. Apparatus for Specific Gravity by Barometric Columns.(See Fig. 67.)—A wide-mouthed bottle is fitted with a cork carry-ing three tubes, the two longer being about 2 ft. long. Thethird is bent at right angles a short distance below the cork, andhas attached to it 6 or 8 in. of rubber tubing, which termi-na
. Laboratory exercises in elementary physics. fine. Apparatus for Atmospheric Pressure.—The barometer-tube is3 ft. long. The device for removing air-bubbles is a featherabout 2 in. long, cut down to ^ in. in width, fastened firmly bythread to the end of a straight, stiff iron wire 3£ ft. long. Apparatus for Specific Gravity by Barometric Columns.(See Fig. 67.)—A wide-mouthed bottle is fitted with a cork carry-ing three tubes, the two longer being about 2 ft. long. Thethird is bent at right angles a short distance below the cork, andhas attached to it 6 or 8 in. of rubber tubing, which termi-nates in a mouth-piece formed from glass tubing 3 or 4 in. is also provided a plug of glass rod with which to replacethe mouth-piece when the tube has to be closed. In order thatthe bottle may be air-tight, the cork with the three tubes insertedis immersed for some moments in melted wax. It is then quicklyremoved from the wax, the tubes cleared by blowing throughthem, and the cork crowded into the bottle as tightly as possible,. 244 APPENDIX C. HEAT. Apparatus for Testing Thermometers.—A piece of large glasstubing about 1 ft. long is supported vertically. In the upperend is a cork with two holes, one for the thermometer and onefor the steam-pipe. In the lower end is a cork perforated forthe escape of the steam. Apparatus for the Latent Heat of Steam. (See Fig. 75.)—Dis a glass bottle of 2 to 4 1. capacity with the bottom cut off, ora tin cylinder with a hole in the bottom fitted to carry a the condensing coil by bending four or five feet of the com-mon size of glass tubing into a spiral, with turns about 1 in. diameter should be such that when placed in D there will beabout an inch between the tubing and the sides of the vessel;the height of the coiled portion of the tubing should be aboutthree fourths that of D. The curved form required may be ob-tained by bending the tube a few degrees at very frequent inter-vals. Sharp bends weaken the a
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
