LIGHTING 



427 



common application now to be found of this absorbed gas is 

 seen in Presto-lite, which is used for automobile lighting. 

 A small tank of the compressed gas is distributed through the 

 tubes after passing through a valve. The pressure under 

 which acetylene gas burns is very light, not exceeding 



To serv/ee pipe 



After University of Minnesota 



Fig. 326. Acetylene generator and holder, in two units. This should be 

 installed in the basement, away from frost. 



3 ounces. The heating power per cubic foot of acetylene 

 gas is about twice that of ordinary city illuminating gas, 

 and about two-thirds that of Blau-gas. It has a wide range 

 of exp 1 osibilitv as compared with city gas and Blau-gas. 

 However, acetylene gas may be burned without a mantle, 

 producing a light which is admittedly nearer to sunlight than 

 any other artificial light. It will not burn in an ordinary bat- 

 wing burner, but requires a special burner, and burns at the 



