The second-order theodolite was made in 1980 and represents the pinnacle of Zeiss theodolite technology. The color and shape are typical of Zeiss instruments of the last era of optical instruments. The instrument has full functionality and is extremely structurally stable. The optical plummet, centric alidade toric level, compensator and repetition screw simplify the measuring process. The method of reading on circles with the coincidence of the diametral points of the circle division by means of a wedge optical micrometer provides the measurement resolution of 1''.
carl zeiss jena theodolite theo 010a or theo 010b pdf
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The second-order theodolite was made in 1953. The instrument has a modern design and is the predecessor, at least for students, of the legendary Theo 010A. The two models differ mainly in the way the vertical circle index is adjusted. The Theo 010A has a coincidence vertical circle level, which requires a longer procedure when measuring zenith distances.
The instrument has a modern way of determining readings on circles. It was retained until the last models of the Carl Zeiss Jena optical theodolites were manufactured in the 1980s. With the coincidence of the diametral points of the circle division by means of a wedge optical micrometer, it provides the resolution of 1''. The divisions are read through a single microscope, and a special screw is used to switch between the two circles.
www.leica-geosystems.com/metrology Leica TM6100A Industrietheodolit Produktbroschüre Besser als gut Leica Geosystems Aufgrund ihrer Winkelgenauigkeit von 0.5 sind die Industrietheodolite von Leica Geosystems
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