Editorial Product Review:

Item Description:
Experience this sphere powered by the sun! The vanes in the Radiometer are alternately dark and light in color. When the light strikes these vanes, it transfers heat to each one - but not at the same degree. The lighter vane reflects the rays and the darker vane absorbs the rays. The stronger the light, the more energy there is causing the vanes to spin faster.









Product Availability: Usually ships in 24 hours

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Customer Rating: - Well Constructed, Good Price
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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Customer Rating: - Educational
What an educational product and the children loved to see how fast the flags will spin in the sun. The reason why I gave it 4 stars is because it could break easily so we can't let our 3 or 5 year old hold it. But, overall it is a wonderful product.