i?i a durable Manner. %i^ 



The following procefs for tinning is attended with no 

 clanger from poifonous ingredients, as no lead is ufed in it ; 

 the tinning, too, is exceedingly durable, adds ftrength to the 

 copper veni'lj and fecures it from the a<Slion of acids much 

 longer than the common tinning: — When the veflel.has 

 been prepared and cleaned in the ufual manner, it muft be 

 roughened on the infide by. being beat on a rough anvil, in 

 order that the tinning may hold better, and be more inti- 

 mately connefted with the copper. The procefs of tinning 

 muft then be begun with perfedlly pure grained tin, having 

 an addition of fal-ammoniac inftead of the common colo- 

 phonium. Over this tinning, which muft cover the copper 

 in an even and uniform manner throughout, a fecond harder 

 coat muft be applied, as the firft forms only a kind of me- 

 dium for conne6ting the fecond with, the copper. For this 

 fecond tinning you employ pure grained tin mixed with 

 zinc in the proportion of two to three, which muft be ap- 

 plied alfo with fal-ammoniac fmooth and even, fo that the 

 lower ftratum may be entirely covered with it. 



This coating, which, by the addition of the zinc, becomes 

 pretty hard and folid, is then to be hammered with a fmooth- 

 ing-hammcr, after it has been properly rubbed and fcow- 

 ered with chalk and water, by which means it becomes more 

 folid, and acquires a fmooth compa6l furface. 



Veffels and utenfils may be tinned in this manner on both 

 fides. In this cafe, after being expofed to a fufficient heat, 

 they muft be dipped in the fluid tin, by which means both 

 fides will be tinned at the fame time. 



As this tinning is exceedingly durable, and has a beautiful 

 colour, which it always retains, it may be employed for va- 

 rious kinds of metal inftruments and veflfels which it may be 

 neceflary to fecure from ruft. 



Another durable, though fomeivhat expcnjive, Method of 

 T'lnnhig. 



This tinning, which confifts of more articles and is dearer 

 than the former, can be applied to metals and metallic mix- 

 tures, and, when well pr 'pared, is exceedingly durable; which 

 maki.'^ up, in fonic meafure, for the coft. It is as foliows:— 

 V f d Take 



