to Art tf Pottery. [Book VI. 



the baking. In making this flone-ware great pains 

 are taken to employ only the finer particles of the clay 

 and flint; With this view the clay is much beaten iri 

 water, by which the finer parts being mixed with the 

 fluid are fufpended, while the coarfer fink to the bot- 

 tom of the vefiel. The thick liquid, confiding of 

 water and the finer particles of the clay, is farther pu- 

 rified by pafTing it through hair and lawn fieves of dif- 

 ferent degrees of finenefsi After this the liquid is 

 mixed, in various proportions for different wares* with 

 another liquop, of about die fame denfity, and eonfift- 

 ing of flints calcined j ground^ and fufpended in water. 

 The mixture is then dried in a kiln, and afterwards^ 

 being beaten to a proper temper^ it becomes fit for 

 being formed at the wheel into dilhes, plates, bowls^ 

 &c t When the ware has been expofed to heat for 

 about forty-eight hours; it is glazed by means of com- 

 mon fait. This is thrown into the furnace through 

 holes in the Upper part of it, and being converted into 

 a thick vapour by the heat, is applied to the furface of 

 the heated ware, and caufes it to vitrify. This curious 

 method of glazing earthen ware was introduced into 

 England by two Dutchmen, near a century ago. It 

 appears to be produced by a combination of the alkali 

 of the {alt with the filiceous earth of the pottery. The 

 yellow or queen's ware is made of the fame materials 

 as the flint ware, but in different proportions. The: 

 glazing is alfo different ; it is made by mixing toge- 

 ther in water, till it becomes as thick as cream j one 

 hundred and twelve pounds of ground white leadj 

 twenty-four pounds of ground flint, and fix pounds 

 of ground flint gLfs. The ware, before it is glazed,- 

 is baked in the fire, by which it acquires the property 

 of flrongly imbibing moifture; it is then dipped in 

 this compofition, and fuddenly taken out. It is after-* 



wardl 



