102 



SCIENCE OF HOME AND COMMUNITY 



used in cooking, thus doing away with the dust and incon- 

 venience of coal and wood stoves. 



Fuels used in cooking. One of the most common means 

 of cooking is the wood or coal range. This is so constructed 

 that the heated gases are forced around the oven before 

 escaping up the chimney. Gas ranges are very widely used 

 in towns and cities. The heat can be started, controlled, 



Air Enters 



FIG. 31. A kitchen range. 



and shut off at will, and the gas range is especially advan- 

 tageous during warm weather. The burners are so arranged 

 as to mix air with the gas, thus producing a complete burn- 

 ing, which gives a very hot, blue flame. Usually these burners 

 are adjustable, so that the proper amount of air may be 

 admitted to give the hottest flame. 



LABORATORY EXERCISE 13 



Purpose. To study the working of a Bunsen burner. 

 Directions. The burners on a gas range work on the same 

 principle as the Bunsen burner. Take a burner apart, noting 



