On the Manufacture of Glass. 113 
hese materials are each separately ground, and silted 
through a fine seive—they are then put together into a trough, 
and intimately blended while in a dry state; water is now 
poured in, until the whole mass acquires the consistence of 
mortar. In this state it is suffered to remain ten days or a 
fortnight, covered with a wet cloth. It is found at the end 
of this time, of the consistence of dough and nearly as te- 
nacious. A workman is now employed to turn it, and work 
it with his feet. He commences by cutting it into slips of 
an inch thick, and three or four inches wide; these he lays 
on the bottom, at the farther end of the trough, when he has 
; the bottom in this manner, he gets upon it, and con- 
solidates it with his feet; he thus continues until the whole 
mass is thoroughly trodden. This operation is performed 
daily until the clay becomes solid, or in other words until all 
the air has been pressed out of it, so that upon cutting it 
open it presents an even uniform surface. i 
of a proper consistence, pots may be made of it. But it is 
thought to improve if it is suffered to remain in this state six 
or twelve months before it is formed into pots—and as far as 
from the mould. The mould being thus pennant he cuts 
off a piece of clay, as much as he judges sufficient to form. 
the bottom of the pot, together with four or five inches of 
the side—this he places upon a board of a size to cover the 
bottom of the mould, the mould is now placed over this, and 
the workman getting upon the clay, treads it down aro 
the bottom. The centre of the clay is then beat down to 
the proper thickness of the bottom of the pot, by a block of 
wood made for the purpose, and the remainder of the clay, 
beat up around the sides of the mould by the hands to the 
desired thickness—the sides of the pot are then extended by 
beating small rolls of clay, upon the inside of this with the 
hands, until they are brought to the top. The inner surface of 
Vot. XVI.—No. 1. 15 
