peep show; viewing device with lens
Historical device: a box or stand with a lens for viewing enlarged pictures, often used in Edo-period entertainment. Compare のぞきからくり.
See also: 覗き機関 (のぞきからくり)
In the Edo period, the peep show was a popular attraction at festivals.
water glass; hydroscope; underwater viewer
A box or tube with a glass bottom for viewing underwater, used for observing fish, seabed, etc. Compare 箱眼鏡.
See also: 箱眼鏡 (はこめがね)
The fisherman searched for schools of fish underwater using a water glass.