Bowl-Black painted brass, filler plug at side. Base of bowl fitted with domed frosted glass container which is filled with liquid as a balancer. Inside of bowl painted white with four black wire lubber pointers projecting from side of bowl. Verge ring graduated to 360 degs.
Card -Dia. 6.5" (16.5cm) Mica(?), outer rim painted white with black markings, graduated to 360 degs. and quadrantally in degrees. Centre of card painted black.