Vintage Theodolite TG-5 PHI ЗМИ / ТГ-5. 1961 year

Description

The TG-5 Mining Theodolite is intended for the production of mine surveys and mines, as well as for surface engineering and geodetic work with reasonable accuracy. When working with a theodolite for trigonometric leveling, a bubble level on the tube is used to provide a horizontal sighting beam. Measurement of linear distances with a theodolite is carried out using telescopic grating rangefinder threads and centimeter rails. Theodolite is one of the universal goniometric instruments with a repeating mechanism. The design of the TG-5 theodolite is based on the well-known mountain theodolite TG-1, but some of its components have been improved, which improves its performance: for example, replacing an external focusing telescope with an internal focusing telescope. The positive qualities of the theodolite are: simplicity of design, which makes it easy to disassemble and clean the mechanical and optical parts of the device; Reliability and accuracy of measurements in mine surveying; the use of corrosion-resistant materials, and for the scales of limbs and vernier - silver, which increases the service life. Serially produced in black (before 1966) and silver (after 1966) colors in a wooden crate circa 1958-1967. Approximately 6 thousand pieces were produced. PROPERTIES - reading accuracy along a horizontal circle, sec. - 30; - reading accuracy in a vertical circle, sec. - 30; — focus limits, m — from 2 to infinity; - increasing the whistle - 21x; — field of view of the tube — 2°10′; - equivalent focal length of the tube, mm - 216.21; — diameter of the free aperture of the lens, mm — 25; - rangefinder coefficient - 100; - magnifying glass - 6x; — Level division price, sec.: — superimposed level — 20; - on the pipe - 35; - on the allidade and the column of the horizontal circle - 60; - on the allidade of the vertical circle - 35; — diameter of the horizontal circle, mm — 120; — diameter of the vertical circle, mm — 90; - the price of the smallest division of the vertical and horizontal circles, min - 20; — theodolite height — 300 mm; missing a protective glass of the magnifying glass and the light pad (last photo)