1970S Vintage Spinning Solar Radiometer Bank
Fantastic 1970's vintage spininng radiometer bank. Save with solar energy coin bankin perfect condition, this lucite bank ahs a slot for holding your change and the box slides apart for removal of money. Fascinating radiometer spins when bank placed in direct sun light. What is a radiometer you ask?
The spinning radiometer is just as much fun to examine now as when first designed in the 1870's. First. Made almost 140 years ago by the british invnetor who first developed.
The vacuum tube that edison then adapted into a light bulb. It. Demonstrates energy transfer from natural radiation (light). The. Radiometer consists of a ste of four vanes (shiny on one side and black. On the other) sensitively balanced on a spindle in a partial vacuum. When exposed to light, teh vanes revolve. The blackened vaen becomes.
Htoter than its opposite shiny side and repels residual air molecules. Frmo its warm surface. This tiny difference in air pressure is what. Causes the vanes to rotate the brighter the light, the faster the. Rotation.
Heat energy is being converted into mechanical energy. And ti will go on like this forever, so long as the light is on. Delight your children delight yourself impress teh unimpressible! It's simply plain fun and a good lesson in basic physics.
By the way, the radiometer absorbs light. It does not give it off.