J. L. Smith on flame heat in the Chemical Laboratory. 348 
to complete the combustion; yet even with this, the flame is 
ollow in its lower portion, having a cool center, its most in- 
tense heat being at about three or four inches above the end of 
the tube in the smaller Bunsen-burners, and eight or ten inches 
in the largest size. If a proper access of air is not allowed to 
cuprous chlorid. 
The best heating effects of the gas used in the ordinary round 
Bunsen burner, when employed in the heating of crucibles and 
other vessels, are not obtained; yet in the great majority of 
cases the small loss of gas is not worth considering, especially 
as to obtain better results in most cases, would only complicate 
this beautifully simple instrument. 
To get the best effects of heat, we must imitate the principle 
applied in the Argand burner, namely to flatten down the exit 
of the mixed gases. It was by following out this principle that 
r. Gore was enabled to make a burner having a number of 
radial flat orifices as repre- 1 
Sir in the figure. 
ith the flame from this 
burner introduced into a cer- 
tain form of refractory cylin- 
ers, cast iron can be melted 
in ¢ 
long. This burner and its furnace is of but limited applica- 
other purposes; such furnaces are made by Weisnig of Paris, 
and Desaga of Heidelberg. 
