Definitions
from The Century Dictionary.
- noun A simple kind of lens, formed by a few drops of water placed in a small brass cell with blackened sides, and having a glass bottom.
Etymologies
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Examples
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The result is as follows: -- experience has shown the distance from the eyeball at which spectacle-glasses can be most conveniently placed; now at that distance, the joint effect of the concave water-lens and the convex glass spectacle-lens, is to produce an opera-glass of exceedingly low magnifying power, that requires a small adjustment for accurate definition at different distances.
The Art of Travel Shifts and Contrivances Available in Wild Countries Francis Galton 1866
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