34 



LIGHT 



lamp, or alcohol lamp, test tubes, test-tube holder. 



Materials: Pieces of wood, candle, iron wire No. 28, 

 soft coal. 



a. Darken the room as much as possible. Bijrn 

 pieces of wood (matches will do) and describe the light 

 which is obtained. Light the candle. Is the light steady? 

 Why? Light the kerosene lamp but do not put on the 

 chimney. Describe the flame and light obtained. Would 

 you like to be in a room for a long time with this kind of 

 a light? Put the chimney on and state what difference 

 you note. 



b. If there is gas in the school, light 

 a Bunsen burner and describe the 

 light when the dampers at the bottom 

 are closed. Open the dampers. What 

 is the difference in the light? Hold 

 a piece of No. 28 iron wire, colled into 

 a spiral, in the flame. Where does the 

 light come from? Light the alcohol 

 lamp. What kind of light does burn- 

 ing alcohol give? Could you read by it. Hold the iron 



Cut supplied through United State Department of Agriculture 



