THE HEAT OF THE BODY 



125 



is under 25 F., or pack it in a mixture of crushed ice and coarse salt. 

 Examine after two hours. Account for the result. 



2. Cast lead weights. Make exactly 1 oz., 2 oz. to use on a 

 letter scale. Cast lead toys. 



3. Make a study of heat-conducting materials used in your 

 home and write a report upon them. 



4. Make a study of heat-insulating materials used in your home 

 and write a report upon them. 



SCIENCE CLUB ACTIVITIES 



1. THE FORCE OF STEAM 



Put a cupful of hot water into a half-liter flask. Stretch the 

 open neck of a rubber balloon over the opening of the flask. Fasten 

 the flask to ringstand with a clamp. Boil the water, being very 

 careful not to allow the flame to come near any part of the rubber 

 balloon. Continue the heating until the steam escapes into the 

 room. Have the club members stand 

 several feet away until the climax is over. 



2. BOIL WATER IN A PIECE OF PAPER ^ hot Voter 



Get a piece of stout paper of medium 

 thickness about 5" or 6" square. Fold 

 this to make a conical cup. Have the 

 fold come inside the dish so that outside 

 there is only one thickness of paper be- 

 tween the water inside and the flame 

 outside. Place the cup in a ring on the 

 ringstand. Trim off the paper that is 

 more than -J-" above the top of the iron 

 ring when the cup is filled with water. 

 Put hot water in the cup to start with, and place a low flame under 

 the cup. Heat until you see the water boil. 



REFERENCE READING 



Carpenter, F. G., and Carpenter, F., The Clothes We Wear. American 



Book Company, 1926. 



Collins, A. F., Experimental Science. Appleton, 1929. 

 Collins, A. F., The Boys' Book of Experiments. Crowell, 1927. 

 Tower, S. F., and Lunt, J. R., The Science of Common Things. Heath, 



1922. A study of fire, page 146. 

 Whitman, W. G., Household Physics. Wiley, 1932. Heat, pages 24- 



30; Thermometers, pages 55-65; Pressure Cooker, pages 105-114. 



