Glass vessels, by placing a hot prepared cameo, of the usual
composition, upon the hot manufactured vessel; a small piece of liquid
Glass is dropped on it, and becomes welded; and, if rubbed while hot,
the upper coat of fused Glass will be spread as thinly as possible upon
and around the cameo, behind which are driven any air bubbles that may be
entrapped; thus completely isolating the device between the two Glasses.
These incrustations require very careful annealing.
AMERICAN PRESSED GLASS
Pressing is a mechanical operation, unknown