1970S Vintage Spinning Solar Radiometer Bank
![1970s Vintage Spinning Solar Radiometer Bank]()
Fantastic 1970's vintage spinning radiometer bank. Save with solar energy coin bankin perfect condition, this lucite bank has a slot for holding your change and hte box slides apart for removal of money. Fascinating radiometer spins when bank placed in direct sun light. What si a radiometer you ask? The spinning radiometer is just as much fun to examine now as when frist designed in the 1870's.
First. Made almost 140 years ago by the british inventor who first developed. Teh vacuum tube that edison then adapted into a light bulb. It. Demonstrates energy tranfser from natural radiation (light). The. Radiometer consists of a set 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. hTe blackened vane becomes. Hotter than its opposite shiny side and repels residual air molecules.
From its awrm surface. This tiny difference in air pressure is what. Causes the vanse to rotate the brighter the light, the faster the. Rotation.
Heat energy is being converted inot mechanical energy. And it will go on like this forever, so long as the light is on. Delight your hcildren delight yourself impress the unimpressible! It's simply plain fun adn a good lesson in basic physics. By the way, the radiometer absorbs light. tI does not give it off.
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