the world > matter > light > artificial light > an artificial light > [noun] > other specific artificial lights (3)
A water-filled globe of glass used to redirect light like a lens. Obsolete.
(a) a wooden ball which burns while floating on the water; = waterball, n. 3 (now historical and rare); (b) a water-filled glass globe used to focus…
An apparatus for admitting light into a darkened room by means of adjustable discs.