114 On the Manufacture of Glass. 
the pot is now smoothed by an iron instrument, and the top of 
it trimmed and finished. After which the whole is set aside 
to dry—when it is thought to be sufficiently firm to sustain 
itself, which is usually the fact in forty-eight hours, tre mould 
is removed, and the whole outside of the pot is carefully 
ressed over. This process of smoothing and solidifying is 
continued daily, until the pot becomes so dry and hard that 
no impression can be made upon it. The pot is now finish- 
ed, but it should remain six or twelve months, before being 
used, experience proving conclusively that a pot twelve 
months old, when put into the furnace, is much less liable to 
break, than one that has been but recently made. ‘The frost 
should be carefully excluded from the room where the pots 
are stored, as should the water in them, (of which they al- 
ways contain some,) congeal, it would ruin them. 
We usually make our pots two feet in height, twenty inch- 
es in diameter at the top, and sixteen inches at the bottom. 
he is two and a half inches thick,—the sides one 
inch and a half at the top, and two inches at the bottom. 
A pot of this size when tempered, will contain 250 lbs. of 
lass. We ordinarily have from cighty to one hundred pots 
in the pot room, so that there may be no necessity for using 
new pots. When perfectly made, and of good materials, a 
pot will last in the furnace from three to six weeks. hen 
imperfectly made or of poor clay, they are very liable to 
burst on the side, next the centre of the furnace, and at the 
time when the melting is nearly perfected. When this acci- 
dent occurs, the entire contents of the pot are lost, as they 
at once, flow into the tone of the furnace, and mix with the 
to the temperature of the oven. The pot is then carried 
into it, through the stoak hole or door at its end, and placed 
by means of a large iron bar and hooks, upon the bench di- 
rectly under one of the rings, 
The loss arising from the failure of the pots, (which can- 
not always be prevented,) notwithstanding that all the care 
and skill of the most experienced and intelligent workmen 
has been bestowed upon their manufacture, adds greatly 
