WORK UNDER PRESSURE AND IN GREAT HEAT 383 



abroad in the dustiest work — namely, the management of 

 machine drills worked by compressed air. By the use of water 

 jets or other means, which I need not specify in detail, the 

 inhalation of stone-dust from these drills and from blasting 

 can be entirely prevented ; and legislation rendering effective 

 means compulsory was carried through at once with the full 

 support of the management of the mines. 



The accompanying tables show some of the Cornish 

 statistics : 



TABLE I 



Annual Deatks per 1,000 living at each age 



TABLE II 



Deaths of all men who had ever worked Machine Drills, and who died in 



Redruth District, Cornwall, 1900-2 



It is a remarkable fact that while the inhalation of dust from 

 hard stone is extremely dangerous when habitually inhaled, the 



1 Of these, 122 were returned as phthisis. 



