slgwv's photos with the keyword: belt drive

This still has a big pulley (outlined) so that it can be driven by a belt. I expect they were driving the belt with a big electric motor at this point, though, instead of with a steam engine. Small electric motors, the sort we're used to having on each individual machine, didn't come along till much later. All those flapping belts around in those days also did not enhance workplace safety! Bodie, California, USA