ccii GENERAL SUMMARY OF SCIENTIFIC AND 



Cost. 

 No. of Men. g ^ 



24 Hewers (per ton) 1 5 



8 Deputies " 5 



6 Putters " 2\ 



6 Men at cutters 3 



3 Brake and foremen If 



2 Men repairing cutter-chain H 



49 2 7i 



To get the same quantity of coal by hand-labor from the 

 same colliery would require : 



No. of Men. ^ 



C7 Hewers (per ton) 3 3 



6 Putters " 2* 



_0 Deputies " 3f 



79 3 9 



Showing a difference in favor of the coal-cutter of Is. Id. 

 per ton. Taking the best performance of the coal-cutter as 

 the basis of calculation, and extending its economical show- 

 ing over the total production of the United Kingdom, the 

 fact may be considered as demonstrated that if machine 

 work were universally adopted, there would be a saving of 

 at least 6,000,000 effected in raising the 120,000,000 tons 

 of coal now annually produced in that country. So favor- 

 able a showing can, however, hardly be anticipated in this 

 country, save perhaps in the future development of our West- 

 ern coal-fields. 



