200 Remarks on an Estay on Commerce. 



m. The carnage (called a ticking in Shropshire) on which, 

 the coal and ore are landed from the chain at the pit head, 

 moving on four small iion wheels. 



nn. Baskets on which the coal and ore are raised tVom 

 the pits. 



0. The hook which goes into the staple of the haskct to 

 draw it forward when lowering on to the tacki^ng. 



After the basket is lowered, the lacking is diav^n forward 

 by two girls to the edge of the frame, which is laid level 

 with the gmund on its outside, and near lo v. hich the coal 

 and ore are loaded into waggons, ^and aherwa' Da drawn upon 

 iron rail-ways to the furnaces, forges, &cc. 



Fig. 3. A section of a part of the barrel and lire, showing 

 the manner the links of the chain lie on it, on a scale of 

 three inches to the foot. 



Fig. 4. A section of the pulley, with a liiil; of the chain 

 lying in it. 



In a large machine the barrel is fixed 24 or '25 yards from 

 the pit, which is a distance of nine feet in the model sent to 

 the society. 



Although the small chain for the model >yas made '\^ 

 Birmingham, it is remarkably full of twist, ;ind the links 

 in general awry where they join, in some panls as much as 

 half the thickness of the link. It does not, tfierefore, keep 

 well in the grooves, or, indeed, will it at all without a weight 

 of five or six pounds attached to the end of it, and the bar- 

 rel and frame at the proportional distance of about nine feet 

 from each other. 



XXXVII. Remarks on an Essay on Commerce, published in 

 the Philosophical Magazine for June IbOS, Vol. xxxi. 

 Num. 121, p. 8. 



To Mr. Tilloch. 



SIR, 



JL HAVE perused, with much pleasure, in your Magazine for 

 last month, a paper entithd " An Essay on Commerce," 

 written by Mr. James Graham, of Berwick-upon-Tweed. 



A3 



