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Spinning Radiometer
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Spinning Radiometer

Just as much fun to examine now as when first designed in the 1870's
Today's Price:$17.95
Stock Number Item Description Availability Price Order Qty
77G09.01 Spinning Radiometer
In Stock $17.95  
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First made almost 140 years ago by the British inventor who first developed the vacuum tube later adapted by Edison into a light bulb.

The Radiometer demonstrates energy transfer from natural radiation (light). It 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, the vanes revolve. The blackened vane becomes hotter than its opposite shiny side and repels residual air molecules from its warm surface. This tiny difference in air pressure is what causes the vanes to rotate—the brighter the light, the faster the rotation.

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Customers Ratings and Reviews
Free September 2015 Catalog Request
Overall Rating :5 
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5  - 
Spinning fun
Reviewed By:   (Philipsburg, Montana) 
So much fun!

2  - 
Rotate-not yet!!
Reviewed By:   (Burnsville, Minnesota) 
Well, it been in the sunroom-my office-both face west, still looking for it to rotate It is winter in MN, but we still get sun.

Response By: Garrett Wade Tech Department
Thank you for your review on the Spinning Radiometer. We are sorry to hear that it is not working properly. We have not had many complaints on these,  so our guess is that you may have received a defective one. Please feel free to return it for another, or if you wish, a refund. Again, our apologies for the inconvenience.

5  - 
Amazing Science
Reviewed By:   (Gig Harbor, Washington) 
I bought a couple of these for myself and as a gift for young teenagers. It is thought provoking to see the invisible laws of science being played out. Just shining a bright flashlight on the veins will cause them to spin. How does that happen again?

5  - 
Grandpa's Discipline
Reviewed By:   (Herndon, VA) 
My father in law had one of these in his house in Iowa. When my sons were small, they would go to the farm with their mother for the summers in Iowa. When they became rambunctious, Grandpa would take this off the shelf, set it on the kitchen table, and have my sons sit around and watch this neat science project. He would explain how it worked, and my 3 sons would quiet down, and then be mesmerized long enough to change to more normal normal, in door behavior. what a neat way - no shouting, just a way to slow down their energy and fidgeting, and to make them think/wonder on how this little gizmo worked.

4  - 
Reviewed By:   (Dubuque, Iowa) 
I've got to admit peeking at this before including it in a box for family. I'd never seen one and was curious about it. I took it out and held it up to a sunny window and was fascinated. I think I could have watched for hours. I'm sure it will be a great gift for my science-loving gang!

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