flatting them into square panes, in a kiln provided and heated
for the purpose.
OLD VENETIAN FROSTED GLASS.
, is the first gathering;
the second, expanded by blowing; while at nearly a white
heat, it is suddenly plunged into cold water; if immediately rewarmed
and blown, the effect will be as C
; flatten the bottom,
and whet off at D
; attach a ponty as E
and finish the article as usual; but in the latter process, the less
heat the better, or it will melt out the frosting.
Frosted Glass, like the Vitro di
Trino, is one of the few specimens of Venetian work not previously
made by the Egyptians and Romans; and not since executed by Bohemians or
French Glass-makers. The process of making it, until recently practised
at the Falcon Glass Works, was considered a lost art. It has irregularly
veined, marble-like projecting dislocations, with intervening fissures.
Suddenly plunging hot glass into cold water, produces crystalline
convex fractures, with a polished exterior, like Derbyshire spar; but
the concave intervening fissures are caused, first by chilling and