Front. SEMAPHORE PAT US FEB 20 CAN MAR 29 APL 13 ENG 24 1877 ( 2 3/4 in cartouche )
This small lens has color glass applied to the front of lens the substrate is clear glass .
The sides look like at one time had blacking on the edges
which does not appear to be lamp paint.
www.patternglass.com/FlashCaseStain/FlashCaseStain.htm
FLASHING : The application of a very thin layer of glass of one color over a layer of contrasting color. This is achieved by dipping a gather of hot glass into a crucible containing hot glass of the second color. The upper layer may be too thin to be worked in relief. After the piece is dipped in glass of a contrasting color, it is blown to final form.
Cased glass: see Overlay glass:
A technique of putting successive layers of different colors of glass over an object. Sometimes cased glass is cut away to expose the layers of color. The term plating as a synonym for casing appears to be an North American term. The term "cased" is mostly used in Europe.
Front. SEMAPHORE PAT US FEB 20 CAN MAR 29 APL 13 ENG 24 1877 ( 2 3/4 in cartouche )
This small lens has color glass applied to the front of lens the substrate is clear glass .
The sides look like at one time had blacking on the edges
which does not appear to be lamp paint.
www.patternglass.com/FlashCaseStain/FlashCaseStain.htm
FLASHING : The application of a very thin layer of glass of one color over a layer of contrasting color. This is achieved by dipping a gather of hot glass into a crucible containing hot glass of the second color. The upper layer may be too thin to be worked in relief. After the piece is dipped in glass of a contrasting color, it is blown to final form.
Cased glass: see Overlay glass:
A technique of putting successive layers of different colors of glass over an object. Sometimes cased glass is cut away to expose the layers of color. The term plating as a synonym for casing appears to be an North American term. The term "cased" is mostly used in Europe.