10 



about 1 6 inches. This lamp would not generate or vaporize alco- 

 hol. 



Lamp No. 4 was a wick gasoline lamp using same chimney and 

 mantle as Nos. 1, 2 and 3. The fuel was conducted upward from 

 the reservoir, by a wick, into a tube 5-16 inches in diameter. This 

 tube terminated in a small opening at the top and was heated by 

 conduction through a copper rod whick extended upward into the 

 flame within the mantle. In this way the heated tube vaporized 



Lamp No. 3 Operated successfully with gasoline but not with alcohol. 



the gasoline from the wick, generating sufficient pressure to 

 force the proper amount of fuel up through the opening in the 

 end of the tube to fill the mantle. There seems to be no reason 

 why the copper heat-conductor could not be so designed as to 

 conduct enough heat downward to evaporate the alcohol, but with 

 the lamp tested, alcohol could not be generated or vaporized. 



Lamp No. 5 was a pressure overhead generator lamp receiv- 

 ing its fuel through a hollow wire under pressure. This lamp 



