11 



used a 5-inch mantle, 4% inches of which was exposed to heat 

 supported upon a magnesia post in center of mantle. Four series 

 of carefully conducted tests were made upon this lamp, and curves 

 were plotted representing the data obtained in each series . 



Two complete series of tests with each fuel were made with 

 Lamp No. 5 varying the pressure in the fuel supply tank. The 

 results of these tests are shown graphically in Plates I. and II. 

 In the first series of tests, an opening was used in the nozzle of 



Laaip No. -i 'Wick gasoline lamp. DM not operate well with alcohol, but no 

 doubt could be altered to use alcohol successfully. 



the generator of such a size as to give an excess of fuel at 16 

 pounds pressure. In the second series of tests with gasoline, as 

 shown in Plate II., the lamp was provided with a nozzle of such 

 a size as to give an excess of fuel at 36 pounds pressure. In the 

 alcohol test it was found impossible to generate as much fuel as 

 could have been burned in the mantle. This is due to the fact 

 that alcohol requires more heat for vaporization, and hence will 



