horizon glass
English
[edit]Noun
[edit]horizon glass (plural horizon glasses)
- (now historical) A half-silvered piece of glass mounted in a quadrant or sextant, so that the horizon can be seen at the same time as the reflection of a heavenly body.
- 2006, Hampton Sides, Blood and Thunder, Abacus, published 2014, page 258:
- On the morning of August 25, shortly after breaking camp, he looked back with his horizon glass and caught a majestic glimpse of Cabezon Peak […] .