I'm thinking it is a fancy milling attachment for some special purpose, possibly for cutting grooves or spirals.
The Rivett lathe catalog offered a traditional milling attachment and a much more complex transverse milling attachment that was powered, and could be set up for a variety of functions.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.