Bullseye lantern

     I came across this implement in The Prisoner of Zenda, by Anthony Hope. The bull’s-eye lantern, with one or more sides of bulging glass, was in popular use from the early 18th century, similar devices having been made at least as early as the 13th century. Dark until it was suddenly switched on by opening its door, it focused its light to some extent and served the purpose of the modern flashlight. I cannot get an image to copy, but you can look it up.