Below: Theodolite and Metrological Balloon
Meteorological Instuments by Bosch in 1904
This is a catalog for the Bosch Company in 1904. Instruments of this general type were in German Army Artillery Meteorological service but I do not know if this exact brand and variety were used. However, it seems likely that these commercially available examples would have been purchased by the military
If you have more information on the subject please contact me
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All images, research, and text are sole property of Ralph Lovett.