Heidelberg 2022 – wissenschaftliches Programm

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GP: Fachverband Geschichte der Physik

GP 8: Physics and Instruments

GP 8.3: Vortrag

Mittwoch, 23. März 2022, 11:10–11:30, GP-H7

Binocular or stereoscopic telemeters? Two countries, two concepts — •Andreas Junk — Europa-Universität Flensburg

The development of rangefinders in Europe towards the end of the 19th century seems to have been a competition between the British company Barr&Stroud and their German counterparts Carl Zeiss Jena. These companies used different approaches for their so-called telemeters whilst the instruments looked very much alike.

Barr & Stroud preferred a binocular approach for a coincidence rangefinder, Zeiss in turn designed a stereoscopic rangefinder. Whilst the preliminary test results indicated, that the stereoscopic approach would produce better results, Barr & Stroud insisted, that these results could only be produced by users, who did not have certain physiological handicaps. In my paper, I want to line out the (dis)advantages of the instruments as well as the respective motivation and conditions for their construction.