Convex glass is also known as bubble glass or domed glass. It’s made by heating flat glass in frame molds. The longer the glass is heated, the deeper it will bend.
Convex glass is measured like regular, flat glass. Length and width are measured directly across the glass, not measuring the bend of the glass.
One of the most common uses for convex glass today is to cover antique family portraits. During the period of 1880 to about 1920, photographs were also convex and were framed using oval, round, or octagon frames and convex glass.
A recent client found a pair of framed plaster reliefs in her mother’s house, but one relief had succumbed to the elements of the dusty basement. We were able to restore the plaster casting and replicate the original convex glass thanks to the folks at InLine Ovals.