P. F. Browning — Study of Flame Spectra. 507 



Aet. XXXVIII. — On Two Burners for the Demonstration 

 and Study of Flame Spectra ; by Philip E. Bkowning. 



[Contributions from the Kent Chemical Laboratory of Yale Univ. — cclxxiii.] 



In the demonstration and study of flame spectra it is obvi- 

 ously advantageous to impart the colors to the flames for a 

 longer period of time tban can be secured by simply inserting 

 in the flame a platinum wire or asbestos fiber previously dipped 

 into a solution of a compound of the element whose spectrum is 

 desired. 



The purpose of this paper is to describe two forms of appar- 

 atus which have been found convenient for securing a certain 

 degree of permanence to the colors in the flame. 



Fig. 1 shows a burner constructed as follows : An ordinary 



salt mouthed bottle is fitted with a three-holed stopper. 

 Through one of these holes a tube is placed which connects by 

 means of a rubber tube with the gas supply. Through the 

 second a tube drawn out to a jet is inserted and over this jet a 

 porcelain tube is suspended in such a way as to make a color- 

 less flame possible. These porcelain tubes are such as are used 

 often as insulators in electric wiring. They are preferable to 

 glass or metal because they impart no color to the flame and 

 do not corrode. Through the third opening in the stopper an 

 ordinary thistle tube is inserted. 



To operate the burner a piece of marble or a carbonate min- 

 eral of strontium or barium, for example, is placed in the bot- 

 tle with enough water so that when the stopper is placed in 

 position the end of the thistle tube is submerged in the water. 



