Classic Drinking Bird - A Heat Engine - FUN Desktop Novelty - It's Pure SCIENCE! - Buy it at Atomic Mall
Shape glass into a carefully crafted design, add colored fluid, bits of felt, some plastic, a piece of metal, and a feather. What have you got? Well, you might just have a Drinking Bird! Here's a neat action novelty that uses well established principles of thermodynamics and evaporative cooling to produce repetitive motion. This device is a form of heat engine. If the bird's felt covered head is thoroughly soaked with ordinary water, evaporative cooling begins immediately. With the head being cooler than the base that contains the fluid, a pressure change occurs that moves the fluid UP the bird's neck into his head. His head, now heavy, tilts down into the cup of water pictured. This cycle repeats endlessly as long as there is water in the cup. Fun to watch, this item is a great attention getter that's PURE science!