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. A cross section of a compass expansion chamber
1924
National Maritime Museum

. Bearing plate-Dia. 11" (28cm). Brass ring with a heavy pendulum weight on underside. At centre of ring is a glass card 8.75" (22.2cm) dia. with black markings, graduated to 1/4 points and to 360 degs. At centre of card a brass spigot is fitted
1924
National Maritime Museum

. Black wooden frame containing six types of card in use prior to 1924. PATT. 22A. 6.5" dia PATT. 173. 6.0" dia PATT. 158. 5.5" dia PATT. 184. 3.0" dia PATT. 28P. 3.25" dia PATT. 182. 4.25" dia
1924
National Maritime Museum

. Card for a boat's compass. Card: A mica card attached to the float. The card is white marked in black. The graduations are to quarter points. Needle: The two edge bar needles are attached to the float. Dims 3.5" (8.8 cm) x 0.5" (1.2 c
1924
National Maritime Museum

. Card for a liquid compass. Card: A mica card attached to a domed float. The card is white with grey markings graduated to quarter points. Needle: Two edge bar needles attached to float. Dims 3.5" x 0.5" (9 cm x 1.2 cm) Pivot: The pivot i
1924
National Maritime Museum

. Dwarf brass corrector magnet holder for Type O.2, observer's compass fitted with four tubular tubes fore and aft and four athwartships for 2" horizontal magnets. A sleeve, with spring catch, covers the holes for inserting the magnets in tubes.
1924
National Maritime Museum

. Magnet holder, compass corrector (aircraft) Dwarf brass corrector magnet holder for type 0.2. observer's compass. Fitted with four tubular tubes fore-and-aft and four athwartships for 2" horizontal magnets. A sleeve, with spring catch, covers
1924
National Maritime Museum

. Type O.2, spider card Card: Mica ring dia. 2.0" (5.1cm) supported on eight elements which are bent downwards at edge of card and are then bent upwards at their extreme ends. Float dome at centre of spider incorporates an inverted pivot spike on its
1924
National Maritime Museum

Type 6/18 Mark III. Liquid compass Bowl: Grey painted brass, filler plug at side, expansion chamber at base. Electric light socket fitted to side, for illuminating spider at night. Mounted on a frame, containing anti-vibration mechanism, by four locatin
1924
National Maritime Museum

Type O.1. Liquid compass Bowl:White metal. Glazed with domed glass. Four support strutts on side of bowl, these are connected to a plate. This plate is connected to angle iron springs which is in turn connected to a base plate. Base plate has a vernier. F
1924
National Maritime Museum

Type O.2. Brass standard. Upper end of tube is fitted with 4 fore and aft and 4 athwartship tubes for carrying corrector magnets, fitted with brass sleeve which when in place prevents magnets coming out of tubes. Below this is a brass knob which operates
1924
National Maritime Museum

Type O.2. Liquid compass Bowl: Brass painted grey. Has domed glass. Azimuth circle and sights. Has fill hole on side of bowl. Bowl held in a brass outer bowl. White inside with black lubber wire. White lubber line on outside of bowl. Card:Thin rim with ho
1924
National Maritime Museum

Type O.2. Liquid compass Bowl: Brass. Glazed. Fill hole at side. Held in brass bowl holder. White on inside with black lubber spike. Set on brass pillar with locking screw and holes for compensating magnets. Card: White with black markings graduated to 36
1924
National Maritime Museum

Type O.2. Liquid compass Bowl: Glazed. Held in outer bowl of white metal. White inside with black lubber line. Fill hole on side. Tripod attachment with holes for compensating magnets. Azimuth circle. White lubber line on outside of bowl. Card: Thin strip
1924
National Maritime Museum

Type P.1. Liquid compass Bowl: Black painted brass, two filler plugs at side, expansion chamber at base. Mounted at 45 degrees in protective case 5.5" x 5.5" x 3.0" (14cm x 14cm x 7.6cm) containing anti-vibration system. Verge ring carries
1924
National Maritime Museum

Type P.2. Liquid compass Bowl: White metal, held in holder painted black. Three deck brackets, one with vernier. Glazed. Has azimuth circle with two locking nuts. Fill hole on side. White inside with black lubber spike, Expansion chamber underneath. Card:
1924
National Maritime Museum