Three-armed compass

Heath and Co.XX century

Naval Museum

Naval Museum
Madrid, Spain

This measuring instrument has a circle calibrated from 0º to 180º and from 180º to 0º, featuring 2 moving rulers with pressure screws, verniers, and a file. The rulers can be used to form two horizontal angles using 3 points on the ground which, when transferred to the plotter, can determine the position. The instrument is used to create nautical charts, or to allow a navigator or hydrographer to establish their position on a map using the measurement (provided by the graphometer or sextant) of the two angles formed by 3 known points on the land.

It was made by the English scientific instrument makers Heath & Co.


  • Title: Three-armed compass
  • Creator: Heath and Co.
  • Date Created: XX century
  • Location Created: London, England
  • Provenance: It was donated by Captain Enrique Manera Regueyra in 1993.
  • Type: Scientific Instrument
  • Original Source: Museo Naval Madrid.
  • Rights: Museo Naval, Madrid - All Rights Reserved
  • Medium: Brass
  • Length: 46cm
  • Diameter: 16,2cm

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