Liquid compass
Bowl: Grey painted brass, filler plug and air trap at top. Inside of bowl painted white. A white wire lubber line is mounted under verge glass. Mounted in a vertical grey painted metal ring, Dia. 7" (17.8cm) by two lugs fitted with springs and felt pads, to damp out vibrations. A bracket for securing compass is fitted to base of ring and a corrector magnet carier is fitted to top. The suspension system is of an unusual type.
Card: Vertical mica ring, inside painted white with black degree markings, graduated to 360 degrees. Outside black with white markings, graduated to 360 degrees. Attached by wire framework to small float at centre, painted red & blue, with four magnets below.
Needle: Four needles below float.
Pivot: Inverted type, stem unsighted. A white wire arm projecting from side of bowl engages in top of float, to pevent it lifting off pivot.