Your cart is empty.
Your cart is empty.Product Description
Orange Solar Power Radiometer Crookes Solar Energy Spinning Vanes windmill Gift Home Desk Decoration
How it works?
The glass Radiometer is made of a vacuum glass bulb. When it is exposed to sunlight, artificial light, or infrared radiation, its leaves will rotate. The stronger the light, the faster it rotates.
Exquisitely designed
Handmade from high-quality glass. Crystal clear, small and exquisite. It is suitable for occasions such as offices, living rooms, bedrooms, classrooms, study rooms, parties, etc.
Creative Gift
Giving it as a gift to our family, friends, colleagues, and leaders is perfect. As long as there is light, it can rotate continuously, just like our emotions. As long as we treat them sincerely, friendship can be eternal.
Jerry M.
Reviewed in the United States on June 27, 2024
The media could not be loaded.
V. Logan
Reviewed in the United States on February 21, 2024
It turns *only in strong direct sunlight.* Direct. Strong.On days when the sun goes behind clouds and then back out again, it will start and stop. But sometimes it does not restart and requires you bump it. Unacceptable.If it's not in constant bright sunshine then it sits there, the vanes not moving one millimeter.~edit to add: eventually it came to never turn at all, even if you tap it on the surface it sits on. Hot garbage.
Garth Bock
Reviewed in the United States on December 13, 2024
I bought it on a whim. It was setting next to a Crookes radiometer that was around 30 years old. My old one is still going strong but this one slowly died after 3 months. Can't get a replacement now.
G. Hammond
Reviewed in Australia on January 22, 2024
An ornamental toy that has no function other than to spin in the presence of sunlight or other light sources. Works quite well, and I'm considering buying the other two or three colours available.
Nasia
Reviewed in the United States on January 18, 2024
I bought this for my husband for our 11th anniversary and he absolutely loved it! He opened it at the restaurant where we booked for our anniversary lunch and it was a head-turner! Everyone there started to ask how it worked. It’s an eye-catcher on my husband’s mahogany desk. Very classy. A great gift for anyone who wants to ignite the imagination or inspire wonder.
Aaron Batts
Reviewed in the United States on September 10, 2023
The glass piece is pretty as can be, it gives a “tartarian” kind of vibe. When in sunlight the panels obviously rotate and it’s just a neat science-y gadget. I’m a man and I love it personally. Sits next to my tv in my living room near my window. 100% recommend.
Peter M
Reviewed in Canada on August 27, 2023
Works like a charm.
銀
Reviewed in Japan on March 24, 2023
孫のプレゼントに購入しました、良く回ります。晴れた障子越しでもゆっくり回り、窓の柱の影でもゆっくり回りました、日差しがかかるとクルクル回ります。興味を持ってくれるといいですが。
brodie
Reviewed in Canada on June 1, 2022
just the coolest thing ever
MCB
Reviewed in the United States on July 2, 2021
The packaging for the radiometer was very adequate to get such a fragile device to me. It is glass and it has to maintain a partial vacuum inside to work properly so delivery was a concern.This Crooke's Radiometer was originally invented as a physics device and does what it was intended to do. It was intended to measure the power of the light incident on the vanes. Several people commented in reviews that it didn't spin in the light of their common lamp, and that is expected. It would take a strong directed household spot light to focus enough photons on the vanes.If you put the device in any full sunlight it should spin very fast. Normal sunlight is imparting much more energy than my house lamp. Thus sunlight is typically required to take advantage of this physics toy.I have another radiometer made of plastic which spins slower in the same sunlight. I believe this due to that plastic radiometer not passing as much light radiation to the vanes. The glass device passes more of the light. And probably has a better balance of vacuum. The vacuum inside has to have a partial atmosphere to work best.You'll note the spin direction shows the darker side of the vane paddles are pushed away from the light source, which confirms the principle that the absorption of energy and subsequent passing of heat energy to the air molecules inside the device is the cause of the spinning. It does not spin because of the impact of photons because if it did, the lighter side of the paddles would be pushed away and the device would spin in the opposite direction, as more photos would be reflected by the lighter side of the vane's paddles.
Jeremy
Reviewed in Canada on August 24, 2020
I wasn’t sure what I would think of this item. Honestly I didn’t know much about this instrument. Item arrived fast and on time. I thought it would ofBeen bigger in size but That’s ok. After placing the item where sun light was shining, the item started to spin and spin and spin faster. It goes pretty good. I must say it’s a pretty cool thing to have on your office desk or at home. If your into this sorta thing I am recommending this for you.
Michael Blair
Reviewed in the United States on November 7, 2020
Good eye catcher
dog faced pony soldier
Reviewed in the United States on October 8, 2020
Got it yesterday, and yesterday we had a variety of weather, so here's my experience:1) In direct sunlight, it "whir spins". I don't mean it makes sound, but it's moving so fast it's just a blur.2) In indirect sunlight, but still a bright day: steady spin, but not real fast. Maybe one rotation every second or second and a half. But it keeps it up.3) Cloudy daylight: sits there like it's waiting for a bus. Maybe twitches a little occasionally, but no rotation whatsoever.So, there you have it. It actually works better than I had hoped, and so I give this a full five star thumbs up. The colored glass makes for an attractive piece, and I could see giving one of these to just about any science-minded person. The fact that it doesn't spin on a cloudy day is more than compensated for by its behavior in direct sunlight, where it spins so fast that in an earlier age you might have thought it was possessed by demons. You can think that now, too, if you want, but it probably isn't actually true.
Recommended Products