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. A grey painted aluminium corrector magnet holder. Magnets are held in base of tube and can be turned by a key inserted into holes at the side.
1931
National Maritime Museum

. Black card containing six compass cards showing the type of graduations introduced in 1931. PATT. 22A & 193. 6.5" dia PATT. 173, 195 & 198 6.0" dia PATT. 158. 5.5" dia PATT. 183. 4.25" dia PATT. 184. 3.25&quo
1931
National Maritime Museum

. Bowl-Dia.10.25" (26cm) Grey painted brass with glass bottom (bottom fitted with a spigot on which is fitted corrector magnets), filler plug at side of large annular bubble trap. Verge glass has a brass spigot to accommodate azimuth sight. Verge rin
1931
National Maritime Museum

. Coil of wires for the Holmes tele compass.
1931
National Maritime Museum

. Grey painted brass corrector box. Containing two independent pairs of magnets operated by bevel gearing inside box and rotated by square-headed key.
1931
National Maritime Museum

. Liquid compass
1931
National Maritime Museum

. Liquid compass part
1931
National Maritime Museum

. Liquid compass part
1931
National Maritime Museum

. Magnetic correcting device Brass, corrector box, contains two independent pairs of magnets operated by level gearing inside box, which are rotated by turning operating heads with a special key. Brass strap 9.8cm in length fitted to base of box for secur
1931
National Maritime Museum

. Magnetic corrector box Brass containing a horizontally mounted magnet which is turned by level gearing inside box, with the aid of a special key. This example is stripped of its top and bottom to show mechanism.
1931
National Maritime Museum

. Magnetic corrector box Grey painted brass. Box contains two independent pairs of magnets operated by level gearing inside box which are rotated by turning the operating heads with a special key. Fitted in a ring bracket.
1931
National Maritime Museum

. Rotary transformer for the Holmes tele-compass.
1931
National Maritime Museum

. Supply panel for Holmes telecompass.
1931
National Maritime Museum