Crookes tube X-ray machine.
https://diqn32j8nouaz.cloudfront.net..._tube_xray.jpg
Previously:
https://www.homemadetools.net/forum/...250#post150146
https://www.homemadetools.net/forum/...232#post157902
https://www.homemadetools.net/forum/...798#post156106
https://www.homemadetools.net/forum/...057#post157223
https://www.homemadetools.net/forum/...702#post151948
