Sextant made of brass, with a rosewood box elegantly decorated with engravings of brass.
The sextant is an invention of the year 1730 by John Hadler and Thomas Godfrey, to facilitate the navigation of seafaring. The sextant allows to obtain the angular height of the sun above the horizon. The sextant is constructed by a little Binoculars (to see the horizon), two mirrors (reflecting the image of the object), a filter (for the sun), a movable arm and a round arch with graduations. The opening angle is 60 °, a sixth part of a circle, hence the name of the instrument.