Image: Huygens Aerial telescope, 1684

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Description: Tubeless Aerial telescope of Christiaan Huygens (1629-1695).
Title: Huygens Aerial telescope, 1684
Credit: http://www.phys.uu.nl/~huygens/astroscopia_nl.htm
Author: Christiaan Huygens
Permission: Public domainPublic domainfalsefalse This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1927. This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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