Delivery time estimates do not apply to personalized, large or heavy items (over 20lbs.) that require special shipping, items shipped directly from the manufacturer, or out-of-stock items.
Delivery estimates only apply to the contiguous United States. Saturday, Sunday and national holidays are not considered business days for these estimated transit days.
Curious kids and grown-ups alike will be mesmerized by this Solar Radiometer. Also known as a Crookes radiometer—named for its inventor, Sir William Crookes—the small diamond-shaped vanes or wings begin to turn when exposed to light or heat. You'll have to look up the science behind this fascinating device yourself, but you will notice that the brighter the light shining on the glass globe, the faster the vanes turn. Even if you're not inclined to learn about the science at work, you'll enjoy having this unique item on your desk or even displayed on a mantel at home. For ages 8 and up.
Dimensions
Approx. 5"H
