What are the axes of theodolite? What conditions should be met between axes?

I. What are the axes of theodolite \x0d\ Theodolite mainly includes: vertical axis, horizontal axis, telescope collimation axis and collimation tube axis. \x0d\ II。 Satisfied conditions \x0d\ Theodolite is made according to the angle measuring principle of horizontal angle and vertical angle. When the bubble of the leveling tube is centered, the rotating shaft of the instrument is vertical and the horizontal dial is horizontal, so the axis of the leveling tube is required to be vertical. Measuring the horizontal angle requires the telescope to rotate around the horizontal axis into a vertical plane, so it is necessary to ensure that the collimation axis is perpendicular to the horizontal axis. On the other hand, when the vertical axis is vertical and the horizontal axis is horizontal, the horizontal axis is required to be vertical to the vertical axis. Aim the vertical steel wire at the target. Only when the horizontal axis is horizontal and the vertical wire is vertical, the vertical wire of the reticle is required to be vertical to the horizontal axis. In order to make the angle measurement reach a certain accuracy, other conditions of the instrument should also reach a certain standard. To sum up, the basic geometric relationship that the theodolite should meet is shown in the figure: \x0d\ 1, and the axis of the leveling tube in the sighting part should be perpendicular to the vertical axis; LL⊥VV\x0d\ 2。 Crosshair vertical wire should be perpendicular to the horizontal axis; \x0d\ 3。 The collimation axis should be perpendicular to the horizontal axis; CC⊥HH\x0d\ 4。 The horizontal axis should be perpendicular to the vertical axis; Hh ⊥ vv \ x0d \ No.5. The vertical plate indicator should be in the correct position; \x0d\ 6。 The collimation axis of the optical aligner should coincide with the center line of the vertical axis. \x0d\ Unable to insert picture. You can search the schematic diagram of theodolite axis and find it in Baidu pictures.