Bowl- Black painted brass, filler plug at side, expansion chamber at base under balancing weight. Inside of bowl painted white with four black lubber lines painted on side. Mounted in a black painted brass gimbal ring 6.75" (17.2cm) dia. Attached by two black painted brass "L" brackets to the wooden base upon which ACO 541 is mounted.
Card- Dia. 4,5" (11.4cm) White painted mica (?) with black markings, graduated to 1/4 points and to 360 degs. Attached to a large white float at centre.
Needle- Four needles of circular section are mounted on a framework below card and float.
Pivot-Unsighted