Ignoramus21117 wrote:
http://igor.chudov.com/tmp/Bridgeport-Part.jpg

Would anyone know what it is?
I would have appreciated a better picture. This
one looks block-pix'ed.
But, it reminds me of part of the ancient
Bridgeport power feed, from the 1940's.
It had a 7-speed gearbox and a high-low range
gear, for 14 speeds. There was a rectangular box
with a sliding dog clutch to connect the power
feed to the leadscrew shaft. A lever stuck out
the front to engage feed either way, or center for
neutral.

Jon