A glass cup resembling a wine glass. The bulb of the glass is formed of two glass hemispheres, a smaller one inside a larger one; these are connected at the upper rim. The inner sphere is only supported by the outer rim.
The outer hemisphere opens at its base into a stem which flutes outwards at the base to provide a stand. The stem is closed off underneath the base by a protruding glass plug.
Small silver bulbs, possibly mercury, sit on the interior of the glass surface between the walls.
Accession Number: 2009.ph.138
Primary Materials: Glass, Metal: Mercury?
Dimensions (cm): Height = 15.5, Diameter = 7.5
An air gap between two layers of glass can provide insulation and aid with keeping a substance at a relatively stable temperature. The purpose of this piece is otherwise unknown. It may be a glassblower’s demonstration or practice piece.
Excellent: The glass is not broken or chipped. There is a small stain mark on the interior of the glass in the stem.
Manufacturer: Locally made?
Date of Manufacture: 20th cent.
Department of Physics, University of Toronto
Additional Information and References: