The English physicist, Edward Crooks, built the first radiometer to demonstrate, with simple physics and movement, how light can be transformed into energy.
The black and silver coated solar wings are suspended in a semi-vacuum state of a sealed glass ball, and when exposed to radiant light (sunlight or incandescent light), the black coated sides absorb more light and energy than the silver sides. Air pressure builds on the black side of the wings as the absorbed energy raises the temperature of the air molecules on that side, and the increased air pressure causes the solar wings to spin within the semi-vacuum.
Radiometers measure the "radiation" of the light source, the spinning movement intensifies when exposed to stronger light. A radiometer will not spin with fluorescent light.
This page was last updated on: November 26, 2018
Cloisonné, whose history dates back over 500 years, is well known traditional enamelware. It is actually called the "Blue of Jingtai" as blue is the dominant color adopted for enameling, and cloisonné became prevalent during the reign of Jingtai (1450 - 1456) in the Ming dynasty. Owing to the brilliant color and splendid designs, cloisonne has been highly appraised at home and abroad. Regarding the making of cloisonné, it involves elaborate and complicated processes: base-hammering, soldering, enamel filling, enamel firing, polishing and gilding.
Mouth-blow, Marbled Glass Birds from Stade, Germany
Hanging glass birds available in three sizes.
Please note that since every pieces is unique, colors will vary.
German Glass Birds | Starburst Ornaments | Kitras Tree of Life Ornaments
German Radiometers | Egyptian Glass | Miniature Glass Animals