Image: Parallactic Instrument of Kapteyn and Glass Plate Holder
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Description: A photo of the parallactic instrument and glass plate holder built and used by Dutch astronomer Jacobus Kapteyn, used to analyze glass plate photographs of stars seen from the Southern hemisphere (South Africa, photos made by David Gill). Constructed around 1886, used to gather data for the Cape Photographic Durchmusterung.
Title: Parallactic Instrument of Kapteyn and Glass Plate Holder
Credit: University Museum of Groningen database
Author: University Museum of Groningen
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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