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. A "T" shaped circle with spirit level at base of "T" and centre pivot for a shadow pin. There is a magnifying glass without a tube below the adjustable prism. Two semi-circle filters are fitted. At the top of the "T" there
1930
National Maritime Museum

. Card for a liquid compass. Card: The card is a mica band. It is clear with black and white markings graduated to every other point and quadrantally in degrees. It is an Admiralty card. Needle: The two needles are held in tubes which go through the d
1930
National Maritime Museum

. Liquid compass box containing a screwdriver, a pivot removing tool, a cap plug, tweezers, a central plug with key, a funnel and a pivot.
1930
National Maritime Museum

. Magnetic correcting device Aluminium, painted grey, circular box. Has fore and aft and athwartships adjusters and two brass brackets.
1930
National Maritime Museum

. Metal frame. Mirror system similar to that of sextant. For observing horizontal sextant angles. Horizon mirror-Mounted on brackets, has perpendicular adjustment screw. Height 3.25" (8.4cm). Index mirror-Mounted on vertical column with adjustment s
1930
National Maritime Museum

. The box is marked ACO0755.1 and can be viewed via the Whole/Part toggle. Bowl-Black painted brass, filler plug at centre of verge glass, expansion chamber fitted to base at centre of glass at bottom of bowl. A heavy balancing ring is fitted around base
1930
National Maritime Museum

Admiralty Master Gyro Compass AP1005. Gyrocompasses were first successfully developed at the beginning of the 20th century as a solution to the problems of magnetic variation and deviation that are inherent in magnetic compasses. They use the properties o
1930s
National Maritime Museum

Mark II. Astro Compass 6A/1174. Cylindircal flanged base; three knurled levelling screws for circular plate marked 0-360 by 2 degrees; rectangular extension holding two spirit levels and marked 'True Course' with an arrow. Two trunnions and a ca
about 1930
National Maritime Museum