We've found this very stylish new type of Crookes Radiometer which we think would grace any home, office, bunker... It is extremely fragile, stands at around 22cm with a base measuring 7.5cm , and is definitely NOT a toy! Please be aware that it may take a few minutes for it to settle after it has been unpacked: once it has you will see it in action, especially in direct sunlight.

DO NOT HIT IT OR BANG IT ON ANY SURFACES: THERE IS A GOOD CHANCE THAT THE GLASS WILL GET DAMAGED: UK SALES ONLY AS WE CANNOT GUARANTEE ITS SAFETY.

The Radiometer was invented by Sir William Crookes in 1873. The glass bulb is evacuated to create a partial vacuum; inside the globe there are 4 vanes and these are mounted on a simple pointed bearing to reduce friction.

Just place it in sunlight  or a bright beam from a torch and watch it spin! Plus: you don't need any batteries for it...