It would become the first Wild theodolite - and perhaps the first theodolite at all - to feature an automatic compensator for the vertical circle. The T1A would be followed by the T1A-E - 'E' for the 'Erect' field of view - in 1959. This Wild T1 here, however, still has the old normal vial. Thanks to the compensator it was no longer required to fully level the instrument to obtain a vertical angle within the specs of the instrument. The T1 has a similar vial for the vertical circle as the, which was replaced in 1957 by a liquid compensator to create the (the A stands for 'Automatic'). The instrument was dubbed 'Double Centre Theodolite', probably as it was the first Wild Heerbrugg theodolite to have an exchangeable tribrach (see ), quite similar to the one of the Heinrich Wild designed in the early 1920s. Development Originally designed in 1933 the instrument was the less precise sister of the. In August 2014 this Wild Heerbrugg T1 with original steel domed container and wooden pyramid transportation box arrived in the collection. Figure 1: The 1948 Wild Heerbrugg T1 theodolite.
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