About this site

. Artificial horizon with a DC-driven gyro in a metal case. The mirror is gimballed and is contained in a gimballed cylinder within the case.
1923
National Maritime Museum

. Liquid compass Bowl: White metal painted black. Fill hole on side. Azimuth circle. Expansion chamber beneath bowl. Bowl rests on spring plate. Has four steadying arms at side. White inside with black lubber spike. Glazed. Card: Thin strip of paper with
1923
National Maritime Museum

Type O.1. Observer's compass-Experimental Model Bowl: Brass painted black. Fill hole on side. Glazed. Expansion chamber on underside of bowl. Bowl fitted to spring plate and has four steadying arms on side. Vernier on base plate. White inside with 90
1923
National Maritime Museum

Type O.2. Observer's compass-Experimental Model Bowl: Brass painted black. Glazed. Fill hole on side. White on inside with black lubber arm. Expansion chamber underneath. Bowl fixed to spring plate and has four stabilizer arms. Vernier on base plate
1923-4
National Maritime Museum