Interior based reduction tacheometer

The interiorly based reduction geodetic tacheometer TV combines an optical 30-second theodolite and a coincidence rangefinder. The tacheometer is designed for measuring horizontal spans from 2 to 180 m with angles of inclination of plus or minus 45 degrees. Distances to 60 m can be measured as far as almost inaccessible and inaccessible points without resorting to setting up a measured line of a graduated rangefinding pole on the opposite end. Distances of more than 60 m are measured by using a small (0.6 m) graduated rangefinder pole, which is part of the tacheometer set. The design and construction of a rangefinder makes it possible to measure horizontal spans of lines, inclined at an angle of up to -90 degrees, but the accuracy of measurement here is reduced. Experimental models of tacheometers were tested in field and laboratory conditions. After some modification, a high-performance geodetic instrument was produced, which was reliably accurate, and simple to use.