Singer industrial treadle sewing machine - free

[papaof2]

Scroll through the pictures here and tell me what the two-speed Singer treadle machine (starting about picture 5) was used for. Yes, two-speeds - look at the pulleys connected to the treadle. It's a large free-arm machine and, considering the bracing on the head, it was used on heavy material such as leather or canvas. If I had a place to put it, you'd be looking at my pictures :-(

atlanta.craigslist.org/nat/zip/d/cumming-sewing-machines-lamps-etc/7394497548.html