or other Articles from Mines. 197 



will considerably lessen the consumption of hemp, and render 

 it more abundant for the exigencies of the navy. 



VVishino- to sive this method of workino; chains all the 

 publicity in my power. I will obviate all apparent (for there 

 are no real) difficulties which may occur to any person in 

 their application, on his stating them in a letter post paid 

 addressed to me here. 



I am, sir, your most obedient servant, 



Gilbert Gilpin. 



Old Park Iron Works, near Shifnal, 

 Feb. 2, 1S07. 



To C. Taylor, M.D. Sec. 



Expence of tarred ropes for a machine for raising coal and 

 ore from a pit eighty yards deep, for three years and four 

 months. 



Ten ropes each 1 10 yards long, six inches in cir- ^. s. d. 

 cumference, and 5lhs. per yard, 5500lbs. at 

 8d. per lb. - - - - - - 183 6 8 



Deduct 10 worn out ropes 2730 lbs. at id. lb. 119 2 



Net expence of ropes for 3 years and 4 months ^.171 17 6 



Expence of chains for a machine for raising coal and ore 



from a pit eighty yards deep. 

 Two chains each 1 10 yards long, formed off inch 



iron, 28 links to the yard, and weighing 5lbs. 



per yard, UOOlbs. at 6d. per lb. - - 27 10 O 



180 yards of wrought iron tire, with the holes 



punched therein weighing 7lbs. per yard, at 



Is. Cf/. per yard - - - - - 13 10 



540 nails for the tire, 2;lbs. at Gd. per lb. 13 6 



Workmanship, nailing the tire on the barrel, 180 



yards at 2^ J. per yard - - - - 117 6 



^. M 11 



The above chains and tire have been at work three years 

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



N 3 silt, 



