Sextant on Tripod (Signs XVIII/XIX). Sextant. It presents the same characteristics as the I-129, but it is unfinished, as the arc graduation is lacking, as well as that of the Nonius. It is on foot in the form of a tripod, necessary to make observations on the mainland. METAL BASKER WITH THE SECTION OF THE CIRCULAR SECTOR OF 60º ABSTANCE. In its anterior face, a limbo is recessed on which the alidada slips, which revolves around the zero center of the limbo. The alidada carries at its end an Nonian that moves graduated, and to fix it the device is provided with a pressure screw and a coinciden
Sextant on Tripod (Signs XVIII/XIX). Sextant. It presents the same characteristics as the I-129, but it is unfinished, as the arc graduation is lacking, as well as that of the Nonius. It is on foot in the form of a tripod, necessary to make observations on the mainland. METAL BASKER WITH THE SECTION OF THE CIRCULAR SECTOR OF 60º ABSTANCE. In its anterior face, a limbo is recessed on which the alidada slips, which revolves around the zero center of the limbo. The alidada carries at its end an Nonian that moves graduated, and to fix it the device is provided with a pressure screw and a coincidence; By half of the same a magnifying glass with a look to read the graduation. Perpendicular to the plane of the limbo are the mirrors: one attached to the alidada and another to one of the arms of the frame, they have half transparent and the other azogada. On the other arm of the frame, an astronomical glasses are attached whose collimation axis is parallel to the limbo plane. The sextant is a light and easy -to -transport goniometer, which is mainly used on ships to measure angular distances and stars heights in order to Determine the latitude of the place. When observing a star, from which we know its coordinates, measuring its height with respect to the horizon we can solve the position triangle or, if we observe that star at the time when its height is maximum -a moment that will correspond to its passage through the meridian - . The calculation is reduced to a simple algebraic sum of the decline of the star with the height measured with this device.
Size: 1234px × 2025px
Photo credit: © EU/BT / Alamy / Afripics
License: Licensed
Model Released: No
Keywords:
