Eureka gear Free 3D model

From an old Victorian tool catalogue advertising a continuous form relieving attachment.
Has been published in the Model engineer and the book "Gears and gear cutting" by Ivan Law.
The tool is used mounted between the centers of a lathe and, after giving the correct backing-off
action to a tooth on a gear cutter, it then indexes it round to the next tooth and so produces a
continuous relieving action.