These are two very dapper looking gentlemen. I wondered how a friction heater works, and his method was basically a metal tube with a spinning core of wood that produced the friction. Apparently, it could heat a house. Wikipedia mentions he started a company with this idea.
These are two very dapper looking gentlemen. I wondered how a friction heater works, and his method was basically a metal tube with a spinning core of wood that produced the friction. Apparently, it could heat a house. Wikipedia mentions he started a company with this idea.