Course, speed and distance indicators

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Mark IV

ACO1244
Course, speed and distance indicators

Object connections:

Collection Course, speed and distance indicators
Gallery locationNot on display

Object details:

Object ID ACO1244
Description Consists of a white metal circular tray 12" (30.5cm) dia., the rim of which is graduated quadrantally and to 360 degs. A white metal rotatable disc 10.6" (27.5cm) dia. is set in the tray; it is inscribed with alternate red and black parallel lines and carries vertical and horizontal scales graduated 0-32 (horizontal scale having an arrow head at end). Pivoted at centre of instrument are three white metal bars. One bar is graduated 0-28 7"(17.8cm) long has clamp at end operating on outer rim of instrument and is fitted with a white metal disc 3" dia. graduated 0-180, and which has a folding arm 9.5" long, graduated 4-50. The disc slides along length of the bar. The other two bars 6" long are graduated 0-30 and are fitted with a sliding index. In a fitted wooden box 13.25 x 13.25 x 4" (33.7 x 33.7 x 10.1cm) and in lid of box is white metal bar 12.25" long and graduated 0-70.
Date made Unknown

Artist/Maker Elliott Bros
Place made London, England
Credit National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Materials metal: white metal
Measurements Overall: 70 mm x 310 mm x 300 mm
Parts
  • Mark IV (ACO1244)
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