POTTERY 



4797 



POTTERY 



D CT ERY 





From a mound in Arkansas Zuni and Moki Indian specimens in Arizona 



Satsuma Ware 



Chinese Porcelain 



Chinese Pottery 



r of clay is deposited on the sides, when the 



ire is poured out. The porous plaster of 



M absorbs the water, leaving the shell of 



When this has sufficiently hardened the 



1 is taken apart. The most delicate wares 



are made by casting 



Firing. Clay that is hardened by drying will 



again absorb moisture. To prevent this it must 



heated to a high temperature. After the 



pottery has harden drying room it is 



placed in cylindrical earthen cases called seg- 



gars, which are stacked in a kiln one above the 



! usts from thirty-six to forty- 



. and tin- ware is usually heated to a 



winte heat. The ware is allowed to cool si- 



In. The style 



In, degree of heat and time required for 



K vary for different kinds of ware. When 



i from tin kiln the articles are known as 



Glazing. This process consists in coating the 



ware with a substance which, when fired, will 



a hard, glossy finish. Various substances 



are used, including lead oxide or litharge, 



powdered feldspar, flint, white clay, Paris \\ 



r substances. The glaze is ground to 

 d with water. This 



mixture, known as slip, is a little thicker than 

 milk. The articles are dipped in the .-lip and 

 so handled by the workman that the pla, 

 evenly distributed over them. The wat- 

 absorbed by the ware or evaporated, leaving 

 a thin coating of glaze which must be 1 

 by heat; thus a second firing is necessary. The 

 temperature in the glazing kiln is raised -. 

 slowly and the ware is allowed to cool slowly. 

 The firing changes the glaze to a transparent 

 gloss which brings out clearly any figures that 

 may have been placed on the wa 



Color effects are produced by coloring the 

 e and a variety of colors is produced l>\ 

 u-mg glazes that have different colors. On. 

 part of the article may be dipped in one 

 and the other part in unotli inn - ih- 



is poured on the ware in an oven, and the 

 flow stopped by heat, producing beautiful .<had- 

 um effects. Decorations arc put on by I 

 either before or after glazing. In the latter case 

 a third firing is necessary (see CIMN\ PAINT- 

 ING). Glazing is the finishing proqpss, and 

 e comes from the glazing kiln it 

 is ready for the market. 



Varieties of Pottery. There are man 

 . lr,;t all fall within three classes: 



