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Description
Crooks Radiometer Solar Light Mill Amazing Science ToysCrooks Radiometer Solar Light Mill Amazing Science Toys Features:. Invented by the chemist Sir William Crookes in 1873, as a by product of certain chemical research, radiometers are made of glass bulbs, most of which have been removed to form a partial vacuum.. Inside the bulb, on the low friction main shaft, is a rotor with several (usually four) vertical lightweight metal blades distributed equidistantly around the shaft. One side of the blade is
Crooks Radiometer Solar Light Mill Amazing Science ToysFeatures:
.Invented by the chemist Sir William Crookes in 1873, as a by-product of certain chemical research, radiometers are made of glass bulbs, most of which have been removed to form a partial vacuum.
.Inside the bulb, on the low-friction main shaft, is a rotor with several (usually four) vertical lightweight metal blades distributed equidistantly around the shaft. One side of the blade is polished or white, and the other side is black.
.When exposed to sunlight, artificial light or infrared radiation (even the heat of nearby hands is enough), the blades rotate without obvious power, the dark side retreats from the radiation source, and the bright side moves forward. Just place it near a window or directly under an incandescent lamp, because the blades only rotate under the light (sunlight or incandescent lamp).
.Light Pressure Windmill: It is a kind of amazing solar energy scientific experiment equipment. Put it in the sun or irradiate it with an incandescent lamp of about 100W. The Crooks radiometer blade will automatically rotate. If the light is turned off, the blade will Stop turning.
.Elaborate Production: Using high borosilicate glass material, the interior is close to vacuum. The total height is 138mm, the diameter of the sphere is 75mm, and the diameter of the base is 65mm. It is made by hand and has a simple structure.
.Science Education: This physical and technological miracle shows you in a clear way how sunlight is transformed into energy, which helps to develop children, students explore new ideas, and attract children to stimulate their interest in STEM science.
.Easy to Use: Placed near a window or incandescent lamp, when the light is illuminated, the black leaf surface absorbs heat energy, and the white leaf surface releases heat energy, which can push the four leaf surfaces to rotate.
.Creative Gift: The gorgeous and magical glass radiometer is a great gift for those who have everything. It is a technology decoration gift for family, children and friends.
Note: Due to manual measurement, please allow an error of 1-3mm. Please make sure you don't mind before buying. The color may be different due to different displays. Thanks for your understanding.
.Age: 8+
Specifications:
.Color: Transparent
.Material: High Density Silicon Glass
.Total Height: 138mm
.Ball Diameter: 75mm
.Base Diameter: 65mm
.Product Dimensions: 7.5 x 7.5 x 13.8cm
.Product Weight: 100g
.Package Dimensions: 20 x 10 x 10cm
.Package Weight: 300g
.Packing: Carton Box
Package Content:
.1 x Crooks Radiometer
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Exchange/Return Notes
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4.8 ★★★★★
Based on 85 reviews
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Product Reviews
★★★★★ 5
Fun for the Dogs and Kids
Style: Original
My dog seems to love this ball. Super sturdy for an aggressive chewer. Easy to play with. Makes the tube sound when it rolls which keeps the dogs attention well. Super fun. It’s made out of hard plastic so it’s not soft at all. Can take this anywhere.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Doesn’t squeak but the dogs still love them
Our doggies love them!! Very durable! They do not squeak though
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Reviewed in the United States on May 7, 2026
★★★★★ 5
10/10 for my dogs
Color: A.Orange+Blue+Green
super bouncy and fun for my dogs! they love playing with and tossing them around! hard to see in the water tho!
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Reviewed in the United States on May 29, 2026
★★★★★ 4
Lightweight Balls
Color: A.Orange+Blue+Green
lightweight but solid. Unfortunately, I can't bring to dog park for my dog to play with as the larger dogs will destroy them. Not for dogs that chew through everything.
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Reviewed in the United States on January 31, 2026
★★★★★ 5
Fun ball
It doesn’t last a whole long time, but she loves it! It’s crazy and it drives her playfulness crazy!
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Reviewed in the United States on February 8, 2026