LAMP TESTS.* 



The lamps were tested for their horizontal candlepower upon 

 a standard Reichsanstalt photometer fitted with a flicker screen, 

 in the photometer room of the Department of Electrical Engin- 

 eering of the Iowa State College. The standard used was one of 

 several regularly used for photometric testing by that depart- 



i iU_J . CL Lamp No. 1 Operated successfully with alcohol and gasoline. 



ment, and, after the tests were completed, it was sent to an elec- 

 trical standardizing laboratory for calibration and was found to 

 be accurately rated. 



A flicker screen was used on account of the difference in color 

 of the lights given off by the mantle and the standard lamp. By 

 means of the flicker screen the two colors were blended, but a 



"The Agricultural Engineering Section wishes to acknowledge the valuable 

 assistance in the lamp tests rend red by the Department of Electrical Engineer- 

 ing, Iowa State College, the Sun Vapor Street Light Company, the Best 

 Street Light Company of Canton, Ohio, and Mr. A. B. Cox, representing the 

 Pitner Pressure Lamp of Chicago, I llinois. 



