. Elementary physics and chemistry: first stage. Science. EFFECTS OF HEAT. 89 Place the heavy mass on one end of the iron bar resting upon one of the blocks, as in Fig. 64. Let the other end bear upon the needle placed upon the other block and having the straw pointer fixed to it. Heat the bar with a flame, and notice that the pointer moves on account of the expansion of the iron. Procure a 4 oz. flask and fit it with a cork. Bore a hole through the cork and pass through it a long glass tube which fits tightly. Fill the glass with water coloured with red ink. Push the cork into the neck of the
. Elementary physics and chemistry: first stage. Science. EFFECTS OF HEAT. 89 Place the heavy mass on one end of the iron bar resting upon one of the blocks, as in Fig. 64. Let the other end bear upon the needle placed upon the other block and having the straw pointer fixed to it. Heat the bar with a flame, and notice that the pointer moves on account of the expansion of the iron. Procure a 4 oz. flask and fit it with a cork. Bore a hole through the cork and pass through it a long glass tube which fits tightly. Fill the glass with water coloured with red ink. Push the cork into the neck of the flask and so cause the coloured water to rise up in the tube (Fig. 65). See that there is no air between the cork and the water. Now dip the flask in warm water, and notice that the liquid gets larger and rises up the tube. Take the flask out of the warm water, and see that the coloured water gets smaller as it cools and that it sinks in the tube. Select an air ball or a well-made paper bag and tightly tie a piece of tape round the open end. Hold the ball or bag in front of the fire, and notice that the air inside gets larger and in- flates the bag. Or, obtain the flask with a cork and tube, as in Fig. 66. Remove the cork and tube, and, by suction, draw a little red ink into the end of the tube near the cork. Re-insert the cork and gently warm the flask by clasping it in your hands. Notice that the air in the flask gets larger and pushes the red ink along the tube. Melt wax or butter in an iron spoon. Procure a lump of ice, and notice that it has a particular. Fig. 65.—An arrange- ment for showing that liquids get larger when heated. Fig. 66.—When the flask is warmed, the air in it gets larger and pushes up the drop of liquid in the 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 resemble the original Gregory, R. A; S
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectscience
