Meaning of perspective glass | Babel Free

Definitions

1. A kind of early telescope.
2. An instrument for viewing an enlarged image of engraved prints or maps http://www.monticello.org/site/research-and-collections/perspective-glass.
   historical

Examples

“The instrument was at first called Galileo's tube; the double eye-glass; the perspective; the trunk; the cylinder.”

“He mounted, carrying the only perspective glass the vessel possessed. The captain watched him anxiously as he took a long look.”

CEFR level