Don't think there is anything new in engineering. When I was 10yrs old I thought I had invented some thing new, so I showed it to Dad, and he told me how he had one when he was a boy. I had reinvented the pop pop boat. Many years later, I reinvented the solinoid motor (had never seen or heard of up to that time), I even put an artical in Model Engineer, after this I found out about these engines dating back into the 19th century. The Tangential lathe tool is another piece of new / old engineering, there is an artical in vol 1 1898 of Model Engineer. Ian S C