Definitions
from The Century Dictionary.
- noun A prolongation of a telescope-tube beyond the object-glass, intended to prevent deposition of dew, and also to exclude stray light. A small telescope should be provided with a dew-cap, bright without, but dead-black within, and having a length equal to twice its diameter.
Etymologies
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Examples
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When a telescope is used out of doors a 'dew-cap,' that is, a tube of tin or pasteboard, some ten or twelve inches long, should be placed on the end of the instrument, so as to project beyond the object-glass.
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