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- 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
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CHOKING HAZARD -- Small parts. Not for children under 3 yrs.
From the Manufacturer
Top Customer Reviews
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!
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.Read more ›
I'm going to get another one, but not this brand.
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.
Most Recent Customer Reviews
Needed to re-glue the base when I received it. Extremely cheaply built but price defines that. It does work though.Published 2 days ago by Spencer Smith
This one didn't work. I've purchased before and it was great. I didn't try it or until after 30 days.Published 16 days ago by Gary Quick
A favorite from my childhood. Sits in my office and does its thing.Published 1 month ago by BB Noir
I have this on display in my office at work in my window sill. Captures everyone's attention and intrigue. It's fun to watch, but even more fun explaining to people how it works. Read morePublished 1 month ago by Anthony
Just like the one I had when I was a kid. With a strong enough light.. It spins well. Gives me hope to invent a new solar motor, and change the world 🌍.Published 1 month ago by atexan
Had one of these 60 years ago as a child. Bought this as a gift for my 12 year old neighbor boy. He had never seen one, and seemed to like it as much as I did when I was his age.Published 1 month ago by AverageGuy