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Radiometer

by Tedco

Price: $15.23 & FREE Shipping on orders over $35. Details
Only 13 left in stock.
Sold by Always Brilliant and Fulfilled by Amazon. Gift-wrap available.
  • Vanes in the Radiometer are alternately dark and light in color
  • Vanes transfer heat to each one but not at the same degree
  • Lighter vane reflects the rays and the darker vane absorbs the rays
  • For ages 7 and above
  • Recommened Age 6 thru adult
32 new from $10.11

Frequently Bought Together

Radiometer + The Famous Drinking Bird + Toysmith Magnetic Levitator Classic(Floating Revolution Axle)
Price for all three: $23.08

These items are shipped from and sold by different sellers.

Buy the selected items together


WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Details

  • Product Dimensions: 5.2 x 3.2 x 3.2 inches ; 3.2 ounces
  • Shipping Weight: 3.2 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0007YFJI2
  • Item model number: 01800
  • Manufacturer recommended age: 5 - 10 years
  • Amazon Best Sellers Rank: #3,351 in Toys & Games (See Top 100 in Toys & Games)
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (145 customer reviews)
  • Discontinued by manufacturer: Yes
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Product Description

From the Manufacturer

It's the spear powered by the sun! When light strikes the diamond wings it tranfers heat to each one, but not to the same degree. The light wing reflect the rays and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side causing the wings to spin faster.

Product Description

TEDCO Radiometer (Age 8+)

Customer Questions & Answers

Customer Reviews

Very well made and works as advertised.
Tj
In bright sun it spins so fast it's a blur.
Jack Fagan
Great little tool for learning science.
Thor Sparks

Most Helpful Customer Reviews

108 of 109 people found the following review helpful By Zoltan Korliss on August 24, 2008
Verified Purchase
At the time I purchased this version of the Radiometer, the Amazon price was $10.95, with free Super-Saver shipping available. I have seen the identical model retailing in science gift shops and catalogs for $12.95 to $15.95, so I was quite happy with the Amazon price.

The device is sturdily constructed, for what it is. Keep in mind, this is a thin glass bulb similar to a light bulb; it will shatter when dropped. The rotating vanes inside, while intricately crafted, are delicate and not designed to withstand heavy shaking or jarring. It is not a "toy," particularly not for young children. Rather, it is an interesting scientific novelty, or a "curio," not intended for frequent handling.

The bulb is securely affixed to the black plastic base. I appreciate the "retro" appearance of the base, reminiscent of antique bakelite. It is much more attractive and sturdy than the version I remember from my childhood, which had a piece of gaudy colored paper glued to the bottom of the glass bulb. The vanes are nicely painted and well-balanced. The unit will begin to spin when exposed to even muted sunlight. The one I received will spin quite rapidly under bright light without any rattling or shaking, unlike those I remember from years ago.

I am quite pleased with this version of the Radiometer: The Sphere Powered By the Sun (I miss the phrase "Space-Age Sphere," which no longer appears on the packaging), and am ordering several more for demonstrations in my elementary school science classes... and for myself, because... what can I say... it's really cool!
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81 of 83 people found the following review helpful By M. Ross VINE VOICE on January 7, 2011
Verified Purchase
This fascinating little gadget has been around for years. It is the approximate size and shape of a clear, standard incandescent lightbulb, with a base to stand on. Inside, instead of a filament, there is a small structure of four square vanes held atop a sharp needle, allowing the apparatus to spin. The vanes are colored white on one side and black on the other. Through action of direct sunlight, the vanes spin; the brighter and clearer the light, the faster they spin. The physics of it are explained on an insert. No batteries required, just put it on a sunny windowsill and watch it go!

This really is a terrific and fascinating demonstration of the power of the sun. No matter that now that I am older I understand the physics of it, it is still a remarkable and awesome thing. Fun for young and old, it is probably more suitable for older children who are beginning to express interest in the workings of the world around them and for grownups who still retain a measure of wonderment of natural processes like solar power.

But for its durability, I would easily have given this five stars on coolness and educational merit alone. There is no denying that this is a delicate item, unable to withstand the rigors of a toddler's attention; mine was immediately put on a sunny windowsill where, after spinning smartly for two weeks, it quit. It seems another factor of physics, that of friction, led to its demise. Whether the cap that rests on top of the needle wasn't made of tough enough stuff or whether an initial dab of graphite lubrication manufactured-in would have helped, I don't know.
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27 of 28 people found the following review helpful By Ok2bclever on March 25, 2010
Verified Purchase
This is more of an adult's toy than a child's toy due to it is essentially a sealed glass light bulb on a base.

It makes a great conversation piece on my office window sill, especially when the sun is shining and it's spinning.

The unit is well made and small enough to securely sit anywhere it can get sunlight.

As long as you remember to treat it with the caution something made out of thin glass should be treated with it's a nice conversational and educational nicknack.
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10 of 10 people found the following review helpful By Elderbear VINE VOICE on October 8, 2012
Verified Purchase
I was jazzed to have this unit arrive, and I placed it in my office window, where it spun merrily whenever it got full sun for a few hours each clear morning. I'm in SoCal, and our summers are full of clear mornings. I ordered it on June 2. Sometime in the last week or two it has stopped spinning. If I tap it, or otherwise break the stiction in the bearing, it will spin half-heartedly for a few minutes, but will slow to a complete stop regardless of the amount of sunlight it receives. I don't know if the vacuum was not sealed tight or if the "bearing" degraded. At any rate, it is now a static toy. Sigh.

I'm going to get another one, but not this brand.
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9 of 9 people found the following review helpful By William Mann on March 10, 2010
Verified Purchase
My wife bought me the radiometer knowing my love of great innovation and design. I find as I work at my computer I turn into "Rain Man" in a desire to keep uo with the sun's movement. My two year old grandson actually stayed in one spot for over a half hour after I gave him a high intensity flaslight to aim at the vanes. He was enthralled by the fact that he could control something simply by turning the light on and off. I loved this piece of science so much that I ordered four more for my other grandchildren. It is definetly a must buy.
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9 of 9 people found the following review helpful By Mute on November 30, 2009
This product is an excellent example for students to observe and use in laboratory projects. The Radiometer is durable and can be used as a discovery toy when placed in naturally occuring as well as contrived weather & enviornmental conditions. Shadowing with dust or an object that partially shades the solar power can demonstrate the effects caused by the annual, seasonal changes of Earth and the thinning of our ozone layer. Effects of smog can be discovered if you fail to dust or if you breath on the glass when it is cooler than your breath. The novelty & reasonable price of this item makes it an appealing learning tool in the home and school.
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