polemoscope definition

  • noun:
    • An opera cup or field-glass with an oblique mirror arranged for witnessing things that do not lay straight ahead of the eye.
    • An opera cup or field glass with an oblique mirror arranged for seeing items that don't lie right prior to the eye; -- called additionally diagonal opera glass, or side opera cup.
    • A perspective cup fitted with a mirror set at an angle, made for seeing objects that don't lay right prior to the eye: so-named from its possible use within warfare to see the movements for the opponent from behind defenses.

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