object
Bullseye lantern
A named lantern with a thick lens that concentrates a beam. Not a dark-lantern shutter alone, not a bare lantern dump, and not an optical telescope.
Also known as Bull's-eye lantern · Lensed bullseye lantern
object
A named lantern with a thick lens that concentrates a beam. Not a dark-lantern shutter alone, not a bare lantern dump, and not an optical telescope.
Also known as Bull's-eye lantern · Lensed bullseye lantern