Receiver Bowl-Dia. 11.1" (28.2cm) Heavy brass verge ring, verge glass. Inside of bowl black with a black lubber line carried on a white strip attached to side. A bridge is mounted across diameter of bowl with pivot at centre. Mounted on avery heavy brown painted metal base 15" (38.1cm)
Card-Dia. 7.5" (19cm) White paper (?) ring with black markings, graduated to 1/4 points and quadrantally in degrees, attached by threads to pivot at centre. below card is a red and white pointer which is turned by a knob at side of casing.