The discussion of the Amish etc heaters brought back memories of the Depression heaters...
Usually a ceramic light bulb holder, or two, mounted on a board (probably had some air clearance), a 75 or 100W bulb, and a large tin can siting over the bulb.
The can had places cut out at the bottom and the top, the theory apparently being the bulb heated the metal of the can, the warmed air rose, pulling cooler air in the bottom, circulating warmth. I remember the cutouts in the top of the can making patterns on the ceiling.
Had a big kerosene heater in the living room, turned down at night, and this was apparently to help keep our bedroom a little warmer (Chicago winters).
Usually a ceramic light bulb holder, or two, mounted on a board (probably had some air clearance), a 75 or 100W bulb, and a large tin can siting over the bulb.
The can had places cut out at the bottom and the top, the theory apparently being the bulb heated the metal of the can, the warmed air rose, pulling cooler air in the bottom, circulating warmth. I remember the cutouts in the top of the can making patterns on the ceiling.
Had a big kerosene heater in the living room, turned down at night, and this was apparently to help keep our bedroom a little warmer (Chicago winters).