LIGHTING THE HOME 35 



LABORATORY EXERCISE 4 



Purpose. To study the burning of a candle. 



Apparatus. Candle, piece of glass or cardboard. 



Directions. I. Light the candle. After it is burning well, 

 light a match, blow out the candle, and then quickly hold the 

 lighted match about a half inch above the candle. Why does 

 it light? Try several times to see how far above the candle 

 you can hold the match and have it light. 



2. How many parts do you see in the candle flame? What 

 is happening to the paraffin near the wick? Blow out the 

 candle flame and look quickly at the wick and feel of it. What 

 does it contain ? 



3. Press a piece of glass or cardboard down on the flame and 

 hold it so for a second or two. What is formed on the glass? 

 How is it arranged ? 



4. Hold a match or toothpick across the middle of the flame 

 till it begins to burn, then take it away and blow out the flame 

 on the wood. Where does it begin to burn first ? 



5. What do the last two experiments show regarding the hot- 

 test part of the flame ? 



LABORATORY EXERCISE 5 



Purpose. To find out what conditions are needed for a candle 

 to continue burning. 



Apparatus. Lamp chimney with level top, limewater, glass 

 tumbler. 



Directions. I. Light the candle. Invert a glass tumbler 

 over it. Why does it go out? Light the candle again. In- 

 vert over it a canning jar. Does the candle burn any longer? 

 Why? 



2. Light the candle. On each side place a match and on 

 these put the lamp chimney. Place a piece of cardboard on 

 the top of the chimney. Why does the flame go out ? 



3. Light the candle and place it on a piece of blotting paper. 

 Put the chimney over the candle and hold it down firmly on the 

 blotting paper. Why does the flame go out ? 



