Split vision periscope for 2-axis non-contact displacement measurement by Andrew Consroe. 4:42 video.
https://www.youtube.com/watch?v=5vjdLNiMfcc
Previously:
https://www.homemadetools.net/forum/...098#post153555
https://www.homemadetools.net/forum/...299#post177070
https://www.homemadetools.net/forum/...399#post146648
