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. Bowl-Black painted brass, two filler plugs at side. Base of bowl fitted with a glycerine filled domed glass balancer. Inside of bowl painted black with a black wire lubber line mounted against a white painted strip on side of bowl. Verge ring graduated
1920
National Maritime Museum

. Liquid compass Bowl: Black painted white metal, two filer plugs at side, expansion chamber at base. Fitted with inner verge ring graduated with two 180 degree scales adjacent to one another. The outer scale graduated from 270 degrees through 360 degrees
1920
National Maritime Museum

Type 6/18 Mark II. Aperiodic compass Bowl: Brass, painted grey. Filler plug at side of bowl, expansion chamber attached to base. An aperture is provided in side of bowl for illuminating the spider. Bowl attached by three legs with pin and helical springs
1920
National Maritime Museum

. Cross section of a mercury box for the Sperry Mark II Gyro Compass
c1920
National Maritime Museum

. Lens cap for the naval telescope.
1920s
National Maritime Museum

Card's Traverse Calculator. Card's Traverse Calculator comprises a grid with a movable plastic rule, which is attached by a rivet to the lower left corner. Instructions for its use are printed on the bottom. The instrument is used to calculate t
about 1920
National Maritime Museum