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Home Copernicus - Radiometer

Email Zoom Copernicus - Radiometer (13 customer reviews)   SKU:   In Stock Availability:   Usually ships in 1 business days     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 Our Price: $13.99 & eligible for FREE Super Saver Shipping on orders over $25. You Save: $2.00 (13%)     Note: Item may be sold and shipped by another company. Learn more. 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 13 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: ( 13 customer reviews ) Write an online review and share your thoughts with other customers. Most Helpful Customer Reviews 17 of 19 found the following review helpful: A really cool gizmo  Jan 01, 2008 By Duane Moyer A radiometer doesn't do anything useful, but it's really cool. You set it in the light and it spins. That's all. My cousin had one when I was a kid and I was always jealous. It struck me a fun stocking stuffer for my son who is an engineering student. It was a real hit. He immediately set about determining what kinds of light worked best: sunlight, incandescent, fluorescent, flashlight, candle light, heat from a blow dryer. I guess I'm going to have to get myself another one when he goes back to college next week. 8 of 8 found the following review helpful: Classic Toy, Still Awesome!  Jun 24, 2009 By FLYingG0D 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! 6 of 6 found the following review helpful: A fun toy that illustrates some physics principles  Jul 14, 2010 By Dr. Bojan Tunguz 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. 10 of 13 found the following review helpful: A must for any kitchen window sill  Apr 27, 2007 By Burl M. Finkelstein This is a windmill that runs on light. As ling as it is sunny the vanes will spin. A truely intreaguing piece of scientific equipment. I broke mine and missed it so much I had to search for another. 2 of 2 found the following review helpful: Childhood Memories  Jun 01, 2008 By D. J. Ford Very cool! Brings back memories from my childhood visits to the science exhibitions at the Pomona Fair in Los Angeles. It operates well even in low light conditions. Great quality for the price! See all 13 customer reviews on Amazon.com

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