On the Manufacture of Tin-plate. 351 
neath it;—the consequence of which is, 
that the tin in some measure penetrates the 
iron, and this attaches other tin to it, so that 
the whole surface of the iron acquires, by 
this means, a complete covering of that 
metal. 
er Ode 
As no accurate account has ever yet been 
given of the various processes by which this 
is effected, the following outline may pro- 
bably be acceptable to the members of your 
very respectable Society. 
English bar iron of the finest quality, call- 
ed tin-iron, and which is generally prepared 
with charcoal instead of mineral coak, and 
made with the greatest care, for this parti- 
cular purpose, is first cut to the necessary 
length, and then rolled at the mill, by a pro- 
cess which is peculiar to this manufacture,* 
into plates of the requisite thinness, and of 
such form as is suitable for the business. 
These plates are then cut by hand-shears to 
* It would extend this paper to too great a length, or 
I should like to have given a description of this process, 
as it is extremely curious. Should the members of the 
society wish it, I will furnish it. 
