330 THE PRESIDENT S ADDRESS. 



facility of removal, and for re-adjustment to suit the work in 

 hand, and thus to economise time in working. 



The cost of working with the Drill is much less than by hand. 

 The Barrow drill can be worked by 2 men and a boy. The work 

 done hy the drill^ at Dolcoath was 30 fathoms, 3 feet 9 inches, in 6 

 months, giving a monthly average of 5 fathoms 7^ inches, j 



The work done hy hand, in the same ground was 30 fathoms, 3 

 feet 2 inches, in 22 months, or a monthly average of 1 fathom, 2 

 feet, 4 inches. 



The cost of labour hy hand was £28 5s. 3d. per fathom ; cost hy 

 Drill, for everything, per fathom, £20 18s., thus shewing a gain 

 by the boring drill of about five times as much work, done in 

 considerably less than ^ of the time, and with a saving in cost of 

 £7 7s. 3d. per fathom. The machine will admit of 3 or 4 drills 

 being worked together, and if more than one drill is used, the 

 cost will be again diminished in proportion. | 



* Work performed at Dolcoath Mine by Barrow drill : — 



1st month 4 



2nd „ 



3rd „ 



4th „ 



5th „ 



6th , 



Six months' total ... 30 



Monthly average 5 7| 



+ Holes are bored (depending on the nature of the Eock) at an average rate 

 of about 1 inch a minute. Each hole for blasting being about 20 inches deep. 

 Boring and fixing about 20 holes, and removing the debris, occupies about 10 

 hours. 



J Cost by boring machine — an old one, with some waste in fuel. 



Coals (18 tons) <£15 



Repairs 5 43. 



2 Enginemen 6 



2 Smiths 6 



Wages 3 men at <£5 



3 do. .£4 



3 do. ^3 ,£36 



Underground cost — 30 ft. at say 25s. per ft ^£36 



Cost for 5 fathoms .£104 4s. 



Cost for 1 fathom ^£20 18s. 



