While I find random publications--such as this page from _Audels machinists and tool makers handy book_, page 245 Fig 10 & 11 'Method of shifting belt of a coun

While I find random publications--such as this page from _Audels machinists and tool makers handy book_, page 245 Fig 10 & 11 'Method of shifting belt of a counter shaft drive lathe while running...' [1]--about industrial processes utterly fascinating, this one on the Truly Flat Plane is abstruse. [1]: https://babel.hathitrust.org/cgi/pt?id=wu.89089662951&view=1up&seq=281 https://babel.hathitrust.org/cgi/pt?id=wu.89089662951&view=1...