S20 Tro:cfs for Tinning Copper VeJfJs, 



Take pure graiiied tin one pound, good malleable iron onu 

 ounce and a half, platina one dram, filver twenty-four grains, 

 and gold tiiree grains. Thcfe five metals mull be well fufed 

 together in a crucible with one ounce of pounded borax and 

 two ounces of pounded glafs, and the liquid matter muft be 

 formed iaito fmall ingots. Thefe ingots are to be aeain 

 heated and reduced to powder in a warm mortar with a hot 

 peftle. This powder is then to be put in an iron pan over 

 the (ire, where it mufl: be again fufed, ilirring it well round : 

 it is then to be poured into fmall flat moulds, where it is 

 fuflered to cool, and it is then fit for ufe. 



This tinning is to be applied in the following manner: — 

 Firft tin the veU'el with grained tin and fal-ammoniac in the 

 common manner; clean and fcower this coating; then apply 

 the compodtion with fal-ammoniac according to the ufual 

 jsrocefs, and when it is well difFufed fufler the veflel and the 

 tinnmg to cool. Then expofe it every where to a gentle 

 heat to render the adhefion ftronger, and immerfe it while 

 hot into cold water to give it that h.Trdncfs and folidity which 

 it had loll by being heated. The furface is fomewhat rough 

 and gritty: but you then i-ub it hard with a fcratch-bruih ; 

 and, in order to make it even, you afterwards fmooth it com- 

 pletely with fine fand or any polilhing ingredient. 



If one coating does not appear fufficient, a fecond, and 

 even a third, may be applied in the manner above defcribed. 

 Two coatings, however, are fully fufficient for kitchen uten- 

 lils which have been a good deal ufed ; and, if you wifh to 

 have the furf(ice perfeAIy fmooth and even, you may apply 

 a thin coating of -iin, which will fill up all the cavities and 

 render it quite cveri. A coal fire is the heft for this tinning; 

 for turf coals attack the metal^ and interrupt the union and 

 fufion of the coating. 



V. Remarks 



