19th century surveying theodolite.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...theodolite.jpg
Previously:
https://www.homemadetools.net/forum/...616#post185988
https://www.homemadetools.net/forum/...118#post160939
