That saw was powered by a 1/4" electric drill Dave, my dad's got the complete kit at home, there's a circular saw, (that also bolts to a stand to use as a bench saw) and a sort of jigsaw (more like a scroll saw, but with a wider blade) and a little wood lathe, that came with the stand, which is a bench top deal. I think there was a pedestal drill attachment too?
My dad built our first house in 1951 and used that little gadget for a lot of the work. I think he's still got the drill that went with it, along with a heap of other tools that he bought new when he built the house, next time I'm down there I'll take some pics.