A glass prism by the firm of "J. Duboscq of Paris".
The cast iron tripod base holding the gilt brass rod with height adjustment to a maximum of 22".
Chips and nibbles to the glass prism.
A really beautiful object made to the highest quality.
Paris, mid 19th century.
H:37 W:19 D:19 CM
H:14.5 W:7.5 D:7.5 INCHES