Lead. 
263 
waddle as it were, to a side ; while the round ones run 
straight down. They are received into a sort of funnel, 
which extends from the one side of the inclined plane to 
the other, and is divided by several partitions, so that it 
is really the mouth of several funnels, which lead to diff 
ferent boxes. Those in the middle receive the round 
grains. [2 Art . Man. 
The shot when made, is separated into sizes by means 
of sieves, whose wires are set according to the different sizes 
required. The shot is glazed by putting them into a 
barrel and turning it round, till by the friction and attrition 
they become perfectly round, smooth and shining. 
I believe in this country, the proportion of arsenic is 
nearly as follows. About 7 lb. of arsenic is first added 
to about five hundred weight of the metal. Then of this 
mixture, so much is taken to add to the fresh lead, as will 
make the proportion of arsenic about 2 1-2 or 3 lbs. to 
the ton. Of this about one half a pound will evaporate. 
Compare this with the English patent proportions above 
given. 
In the Louisiana country, shot manufactories are estab- 
lished, where the shot is made by letting the lead fall from 
the top to the bottom of the bank of the Mississippi, at 
low water : so that the enormous expence of such a build- 
ing as that in Philadelphia, is saved. T. C. 
To ascertain the quantity of whiting in white lead. 
Take a specimen of flake white which is generally pure 
white lead, an ounce for instance : mix it with twice its 
bulk of lamp-black, or with oil, or with rosin : fuse it, 
and the instant it is fused, take it off the fire, let it cool 
and weigh it. You may fuse it in a small crucible or 
even in a tobacco-pipe, stopping the hole inside with a 
small piece of the tobacco-pipe. Then treat in like man- 
ner the lead you wish to try : The difference in weight 
