128 THE ROYAL SOCIETY OF CANADA 



Conclusions 



As already stated, this series of tests is not yet completed. The 

 results are self-explanatory; they show less difference than was ex- 

 pected between rapid and slow carbonization. The results emphatic- 

 ally disprove many published statements with regard to the carbon- 

 ization of lignite. They show that the yields of gas are low, probably 

 too low to provide the heat and power necessary to run a carbonizing 

 and briquetting plant, unless the carbonizing is carried out at a tem- 

 perature distinctly above that at which the residue of maximum 

 calorific value is obtained. The tar yields are also low, and the 

 pitch to be obtained therefrom only amounts to some 2% to 23^% of 

 the corresponding carbonized residue. Probably 10% would be neces- 

 sary for satisfactory briquettes. 



The yields and calorific values of the carbonized residues, are, 

 after allowing for variations in ash content, in satisfactory agreement 

 with the results of the small scale tests given last year. 



