Nautical Sextant GLH-130-40:
China Nautical Sextant GLH-130-40:
Nautical Sextant is also called marine sextant, named because the length of the arc is about 1/6 of the circumference. It is an optical instrument for measuring the angle between two objects by bringing into coincidence to the eye of the observer,rays of light received directly from one object and reflected from the other.Its principal use is to measure the altitudes of celestial bodies above the visible sea. It is simple, light, and handheld. But it is necessary to see the celestial and water antennas at the same time when use, restricted by night or visibility.
Measurement Accuracy: 40 corner seconds
Star Telescope: 3.5 x 40mm
Identification Rate: 8.75 seconds
IMPA Code: 370331
It consists of three parts, the frame, the optical system and the angle measuring device. The optical system includes a telescope, a dynamic mirror, a fixed mirror and a filter, and the angle measuring device has an indexing arc, a target rod, a drum wheel and a vernier ruler. These components are all installed on the frame, and the optical system and the angle measuring device are jointed together through an indicator rod.