1. The "Sterling" Coal Parlor Stove, is a coal-burning stove, converting chemical energy to heat and light, similar to the Coal-Burning Power Plant diorama.2. The 1927 Refrigerator connects to the refrigerator compressor in the Cooling-Down and Heating Up exhibit.
3. The Animal Power Treadmill, used animal power to generate electricity, similar to how you can power the light bulbs at Brighter Bulbs.
4. The "Vacuette" Non-Electric Suction Vacuum Cleaner, converts the kinetic energy of moving the cleaner to the mechanical energy needed to make the vacuum work. At Pedal Power you convert kinetic energy to electrical energy to run a blower.