

ZINC 17; 



of the metal makes it popular for utensils. In ordinary air, tin 

 does not rust like iron or corrode like copper, and hence tin- 

 lined utensils require less care than copper and iron ones. 

 Rust forms on pans wherever the tin coating is scratched or 

 worn so as to expose the iron beneath. The coating wears off 



FIG. 63. Tinning fire extinguishers. 



most easily at seams and edges, and rust usually appears there 

 first. Tin is a good lining for metal containers in which can- 

 neries " put up " their products because it is not affected by 

 the weak acids in fruits and vegetables. 



Zinc. This metal, like tin, is whitish and has a good luster. 

 The most important use of zinc is in the manufacture of gal- 

 vanized iron. Zinc wears better than tin as a coating on iron 

 that is exposed to the weather or to rough usage. Telegraph 



