Flow Materiali.e., the substance usually containing much lead in the form of powder and placed in the sagger to cause certain colours applied to biscuit ware to run slightly—to be weighed out in front of an exhaust draught and delivered to the glost-placer by an adult male.

PLATE IV

Fig. 1.—No Lead used.

Fig. 2.—Fritted Lead used.

0·9 per cent. solubility.

Fig. 3.—Fritted Lead used.

1·5 per cent. solubility.
13·9 per cent. total lead.