AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[SECOND SERIES] 
Art. XXVIIL—On the Examination of the Bessemer Flame with 
. sees Glasses and with the Spectroscope ; by J. M. SILLIMAN, 
.H., Adj. Prof. of Metallurgy, Lafayette College, Easton, Pa. 
[Read at the Troy Meeting ofthe Am. Association for the Advancement of Science.] 
I. Examination with Colored Glasses. 
_ Ly the Bessemer process, the progress of the decarbonization 
1s determined chiefly by the appearance of the smoke, flame 
and sparks which are emitted from the apparatus. Owing to 
the rapidity with which the reactions take place, it is highly 
' important to catch the exact moment when the blast should -be 
turned off. This is indicated by the color and brightness of 
