J|5 MACHINE FOR RAISING COALS OR ORE. 



Expense of chains for a machine foi- raising coal and ore 

 from a pit eighty yards deep. 



Chains. Two chains e'ach 110 yards long, formed of | 



inch iron, 28 links to the yard, and weighing 



5lbs. per yard, l lOOlbs. at 6d. per lb 27 10 



180 yards of wrought iron tire, with the holes 

 punched therein weighing 7lbs. per yard, at 



1*, 6d. per yard 13 10 



540 nails for the tire, 27lbs. at 6c?. per lb 13 6 



Workmanship, nailing the tire on the barrel, 180 



yards at 2|rf, per yard 117 6 



£43 11 



The above chains and tire have been at work three years 

 and four months, and do not appear to be one fourth worn. 



llopes retained Messrs. T. W. and B. Botfield annex a certificate, that 

 count of the" ^^^Y ^^^^ ^^^ ^^ work at their mines four of Mr. Gilpin's 

 men's prejudi- machines, one with a cylindrical barrel, and three formed 

 of frustums of cones; which machines they conceive 'to be 

 superior to any hitherto known or in use, and producing 

 their eftect at a much less expence. To this Mr. Gilpin 

 subjoins 



You will please to observe, that of the four machines now 

 in use, two only work with two chains each, and they are 

 both formed of frustums of cones ; the other two, the one 

 with a cylindrical barrel, and the other a frustum of a cone, 

 have each a chain at one end, and a patent flat rope at the 

 other. We are induced to adopt the latter plan, to do away 

 by degrees the prejudices, which miners and colliers have 

 imbibed against chains, from accidents which they have 

 been witnesses to in the common way of working. Though 

 the causes of similar accidents are entirely done away by the 

 new method of working, some little of the old prejudice 

 remains ; a thing not to be wondered at, when we consider 

 the uninformed state of this description of men, arising 

 from a life spent in the dark recesses of mines; and, as it 

 ^'cre, cut off from the rest of society. 



From 



