Optical diagram of a T2 theodolite: (1) optical parts of telescope, (2) scale and separating block of optical micrometer, (3) movable wedges of optical micrometer, (4) ocular and objective of reading microscope, (5) fixed wedges of optical micrometer, (6) prism for switching readings by circles, (7) objective of horizontal circle, (8) horizontal circle, (9) objective for combining images of lines of horizontal circle, (10) collective of light system, (11) parts of optical centering device, (12) objective of vertical circle, (13) light mirror, (14) protective glass, (15) objective for combining images of lines of vertical circle, (16) magnifying prism of reading system of level (17), (17) level for alidade of vertical circle
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