"Device For Converting Motion"

I got a railroad forge from craigslist a few years ago.  beautiful flywheel, but rather rusty.  I ran the blower on an electric motor for a while instead.  I decided I wanted less noise and more control.  There are a few variations out there for people powered blowers, one of the most common being the hand-crank blower.

This one is a bit rarer as far as I can tell.  Perhaps that's because of its relative mechanical complexity.  However, unlike all of the hand-crank blowers that I've seen, it does not require gears.  It's all belt driven.

the flywheel assembly was all rusted together, all one with the steel shaft.  I was certain that it was some kind of clutch, just not entirely sure what of it was meant to spin independently on the shaft.