subtense bar การใช้

• A theodolite is used to measure the angle between indicators on the two ends of the subtense bar.
• A subtense bar is a fixed base ( usually 2 meters long ) used in conjunction with a theodolite in the calculation of horizontal distance.
• The distance from the telescope to the subtense bar is the height of an isosceles triangle formed with the theodolite at the upper vertex and the subtense bar length at its base, determined by trigonometry.
• The distance from the telescope to the subtense bar is the height of an isosceles triangle formed with the theodolite at the upper vertex and the subtense bar length at its base, determined by trigonometry.