Depicting the art behind cutting a bolt shorter and not damaging the threads in the process.

This article was originally published with the title “How to cut Threads Without a Screw-Cutting Lathe or Thread-Chasing Tool” in Scientific American Magazine Vol. 102 No. 16 (April 1910), p ...

The dowel to be cut was loaded, and the machine ran back and forth enough times to create a very nice-looking screw thread.