The photo shows a home-crafted gas-powered ice cutter used to harvest lake ice for non-electric iceboxes.
The diesel engine burns fuel to drive the compressor that fills the reservoir with pressure. From the tank a series of high-pressure pipes snake off toward every corner of the factory. A hard rubber flexible hose connects each tool to a pipe. The entire shop runs on compressed air. Every piece of machine is running on pneumatic power. Amos even shows me a pneumatic switch, which you can flick like a light switch, to turn on some paint-drying fans.
The Amish call this pneumatic system "Amish electricity."