19th century surveying theodolite.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...theodolite.jpg
Previously:
https://www.homemadetools.net/forum/...616#post185988
https://www.homemadetools.net/forum/...118#post160939
