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Copernicus - Radiometer

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Copernicus - Radiometer

(10 customer reviews)

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Radiometer Another oldie but goodie. 5" high evacuated clear glass stand 3" in diameter at the top. A four bladed vane is balanced on a needle inside the sphere. Because opposite surfaces of the vanes are black and white, incident radiant energy is absorbed or reflected to a different degree. The result is a spinning vane. The brighter the light, the faster it spins. Simple, but compelling. Brief explanatory instruction sheet included.

List Price:	$15.99
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Product Details

Product Length:	5.0 inches
Product Width:	3.5 inches
Product Height:	7.0 inches
Package Length:	7.4 inches
Package Width:	5.1 inches
Package Height:	3.4 inches
Package Weight:	0.2 pounds
Average Customer Rating:	based on 10 reviews

Features

Light spin this radiometer's veins
The stronger the light the faster they spin
Vacuum sealed globe on a durable plastic base
Comes boxed with informational pamphlet
Explore light and physics

Customer Reviews

Average Customer Review: 4.0

Write an online review and share your thoughts with other customers.

Science in action Jul 28, 2010
I bought a radiometer years ago and set it in the a shaded window corner to be forgotten. Since then I've learned the joys of partaking of the things you grow. Later, after rediscovering this thing, I have a new respect and understanding of photonics. This items has helped me to appreciate light in a new way which aids me in growing most of my own veggies, fruits, and herbs. Good stuff.

A fun toy that illustrates some physics principles Jul 14, 2010
Ever since I first came across one of these toys back in high school, I found it incredibly fascinating. For the longest time I thought it illustrated one of the very fundamental yet highly counterintuitive physics principles: light carries momentum. However, it turns out that this is not the mechanism that makes this toy work. The real physics behind it is a bit more mundane, although no less important. The colorings of vanes cause the air inside the bulb to be heated at different rates, which creates the pressure gradient that rotates the vanes. This is still a very important physical process, and this toy is a fun way of illustrating it.

The overall quality of this toy is fairly good. If not handled too roughly it will probably last forever. The best places to keep it are those that are in the open and receive a lot of light, like the work desk area or a window pane. The light bulb seems fragile and it should not be left in the areas where little kids or animals can easily reach it.

0 of 4 found the following review helpful:

never recieved the item Feb 08, 2010
OMG. I purchased this item and did not get it. I have to review my gifts at christmas to see if I paid for this and never recieved the item.

3 of 3 found the following review helpful:

Classic Toy, Still Awesome! Jun 24, 2009
This is wonderful! I remember when I was a kid, and had one of these. It is not exactly fun to play with actively all the time, or something that you will be using every day to check lighting conditions, but it is definitely something to put on your window sill, or on a dresser or book shelf where it can be hit with the sun. I find it more of a decorative piece.

It is good to see these are still being made and sold! I bought two, and they both arrived VERY well packaged, in perfect condition, and work great! They also come with a little workbook with scientific experiments that can be done with them, and explanations of why it spins. Useful to teach with!

Interesting Experiment Jun 05, 2009
The family enjoyed seeing how this item works. Of course it's not Something someone could play with it. So it now just sits on a shelf to keep from breaking.