12 THE ART OF PROJECTING. 



An alcohol flame is sometimes used with oxygen, the 

 jet supplying the latter forcing the flame upon the piece 

 of lime. The alcohol is fed from a reservoir seen at 

 the back of the lantern. This gives an excellent light, 



Fig. 3. 



and quite sufficient for many purposes. A picture three 

 inches in diameter may be magnified up to fifteen feet 

 and be well lighted. The light produced in this way is 

 called the Bude light. 



OTHER LIGHTS. 



Common illuminating gas may be employed with 

 advantage where the room is small, and great intensity 

 is not required. The form of burner known as the 

 Argand, is best for this use. 



Kerosene and lard oils have been, and are still 



