Hemisferium Gunter's Quadrant (75198)

This instrument is a detailed reproduction of two Gunter-type quadrants originally designed by Edmund Gunter (1581–1626) and crafted in the mid-18th century. The original quadrants, created by unknown English authors, are preserved in the National Maritime Museum in Greenwich, London. This reproduction captures the historical essence and functionality of these early navigation tools.

On one side, the instrument features a local altitude quadrant equipped with pinulae for measuring the Sun's altitude. It includes a plumb line with a sliding bead and various scales, some based on stereographic projection, allowing users to determine the time and solve problems related to the Sun's position. On the reverse side, there is a nocturnal designed to assist ancient navigators by using the positions of bright circumpolar stars for nighttime orientation.

Specifications:

• General Dimensions:

  • Length: 170 mm

  • Height: 150 mm

  • Depth: 7 mm