PRINCIPLES OF COMBUSTION. 



135 



umes of hydrogen and one of carbon vapor; the gross bulk 

 of these three being condensed into the bulk of a single atom of 

 hydrogen ; that is, into two fifths of their previous bulk, as shown 

 in the annexed figures. Let figure A represent an atom of coal 

 gas carburetted hydrogen with its constituents, carbon and 

 hydrogen ; the space enclosed by the lines representing the rela- 

 tive size or volume of each ; and the numbers representing their 

 respective weights hydrogen being taken as unity both for vol- 

 ume and weight/* 



Carburetted Hydrogen. Bi-carburetted Hydrogen. 



A. 



its 



constituents. 



1 atom of 

 Hydrogen, 

 weight 1. 



1 atom of 

 Hydrogen, 

 weight 1. 



1 atom of 

 Carbon, 6. 



its 



constituents, 



1 atom of 

 Hydrogen, 

 weight I. 



1 atom of 

 Hydrogen, 

 weight 1. 



1 atom of 

 Carbon, 6. 



1 atom of 

 Carbon, 6. 



* " Ce gaz (carburetted hydrogen) est compose de 75.17 parties (by 

 weight) de carbone, et 24.33 d'hydrogene; ou, d'un volume de carbone 

 gazeux et quatre volumes de gaz hydrogene, condenses a la moitie due 

 volume de ce dernier, ou, aux 2/5 du volume total du gaz, de maniere 

 que de cinq volumes simples, il n'en resulte pas rflus de deux de la com- 

 binaison." Berzelius, vol. i., p. 330. 



