bullās-eye lantern
Quick Summary
A bull's-eye lantern is a type of lantern that features one or more sides made of bulging glass. This design allows it to focus its light to some extent, serving a similar purpose to a modern flashlight. While similar devices existed as early as the 13th century, the bull's-eye lantern gained popularity in the early 18th century. The term "bull's-eye" can also refer to a simple lens with a short focal distance or a lantern that uses such a lens.12
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