certain High-temperature Boiling-points. 



143 



bottom of the annular space between the tubes, the ebullition 

 liquid, k k, is placed, and it is heated by Wolcott Gibbs's ring- 

 Fig. 1. — Longitudinal section of boiling-point tube. Scale | to |. 



jP 



' 



sP 



oc*y? 



burner, r r. A conical asbestos screen, n n, protects the 

 upper part of the tube from direct radiation. Other screens 



M2 



