Sextant sounding british terminology
Sextant sounding british terminology a simplified and more robustly constructed version of the marine sextant intended primarily for use in hydrographic survey it has no shades, a wide angle low magnification telescope and is generally graduated in minutes of arc it may be fitted with either a vernier or a micrometer reading device both mirrors are silvered all over to enable angles up to 180°to be measured some sounding sextants have a 90°prism attachment which reflects the normal direct line of sight 90°to the left called surveying sextant, or hydrographic sextant in
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
Web site to visit: http://www.iho.int/
Author of the text: INTERNATIONAL HYDROGRAPHIC ORGANIZATION
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