Pottery decorating : a description of all the processes for decorating pottery and porcelain (1907)
Hainbach, Rudolf · London : Scott, Greenwood & son ; New York : D. Van Nostrand Co. · leaf 58
The Preparation of Glazes 47 the cracking or other failure of the crucible necessitates an interruption of the process. … Fig. 10. Fig. 11. Occasionally the ball refuses to rise, although the charge has melted, so that a waste of time and fuel is incurred. This
Pottery craft · Glazes · Color in the ceramic industries
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.