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. A bearing plate or pelorus for use in airships. A copy of one taken from a Zeppelin brought down. The whole made in alloy. Revolving dial: Graduated to 360 degrees fitted with two screws for clamping dial to base plate, base plate has two two pointers w
1917
National Maritime Museum

. A course and distance indicator made of cellulose-based plastic with some metal components. It comprises three plastic discs with two nickel plated arms with sliding cursors. All rotate around the centre of the device. The instrument was intended to be
1917
National Maritime Museum

. Aircraft pelorus Frame: Black painted alloy, with mounting arm but no bracket. Carries an alloy circle, graduated to 360 degrees, which can be rotated and set to course steered. Two lubber lines are engraved on frame, 180 degrees apart. At centre of pla
1917
National Maritime Museum

. Bowl- Grey painted brass, filler plug at side, expansion chamber at base incorporated with glazed bottom. Inside of bowl painted white with two black lubber lines painted on white strips attached to side. Mounted in grey painted brass gimbal ring 11.5&q
1917
National Maritime Museum

. Bowl-Black painted brass, fitted with a rotating verge ring which has a directional arrow and is graduated on side to 360 degs. Fitted with a "Schmalcalder" type prism and a thumb ring. Hinged lid has a sighting line engraved on glass at centr
1917
National Maritime Museum

. Card- White painted mica (?) with black markings graduated to 1/2 points. Needle- Unsighted (set to variation of the North of europe so that a true course would be recorded by card). Pivot- Unsighted Mounted in a glazed wooden frame 11.4cm x 7.6cm x 1.0
1917
National Maritime Museum

. Liquid compass Bowl: Brass painted black. Glazed, white on inside with white and black arrow across the underside of glass. This arrow has inverted spike which fits into cap on arrow to stop it coming off. Expansion chamber at base and fill hole on side
1917
National Maritime Museum

. Liquid compass Bowl: Grey painted brass, filler plug on foreside, combined air trap and corrector magnet carrier at top. Inside of bowl in poor condition and liquid is very contaminated. A white wire lubber is fitted to the foreside. Mounted in two lugs
1917
National Maritime Museum

. Liquid compass Card: Thin metal strip marked to four cardinal points and 3, 6, 12, 15, 21, 24, 30, 33. Has cap at centre with spike. Has four struts. Needle: Two needles slung beneath card. Pivot: Stalk and cup.
1917
National Maritime Museum

. Spare magnetic system for ACO 347
1917
National Maritime Museum

. Cellulose-based plastic plotting instrument for air navigation. The protractor is square with a central circular degree scale marked from 0 to 360 in degrees. Along the top and bottom edges are scales in metres and yards (corresponding to scales commonl
about 1917
National Maritime Museum

. Slide rule made of boxwood, with a celluloid covering and a metal cursor with cellulose-based plastic window. The slide rule has two scales, one marked for distance (from 4000 to 20000), the other for angle. It is used to solve oblique-angled triangles
about 1917
National Maritime Museum