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 of the solar wing 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.
Click picture for larger image!
Radiometers from Germany.
Clear Glass.
Sphere - 5" - 6" long.
Suspended Glass Drop, included - 3"
Total length: 8" - 9"
Price Each:
$60.00/$68.00
This page was last updated on: September 23, 2011
All our Cloisonné Humming Birds are predominantly green, though accent colors will vary.
About Chinese Cloisonné
Cloisonné, whose history can date back to over 500 years ago, 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 quite elaborate and complicated processes: base-hammering, soldering, enamel-filling, enamel firing, polishing and gilding.
HUMMINGBIRD - LARGE Colors will vary.
Measures Aprox.: Wings - 3-1/2" across x 3-1/2" long.
$28.00
HUMMINGBIRD - MEDIUM Colors will vary.
Measures Aprox: Wings across 3-1/4" x 2-1/4" long.
$15.90
GLASBLASEREI CHRISTIAN BERNSCHEIN
"Glass-blowing house of Christian Bernschein"
Mouth-blow, Marbled Glass Birds from Stade, Germany.
We have these wonderful, hanging birds available in three sizes.
Please note that since every pieces is unique, colors will vary.
LARGE GLASS BIRD - $29.50
MEDIUM GLASS BIRD - $24.00
SMALL GLASS BIRD - $19.95
BUTTERFLY - One piece construction with a loop for hanging and four bendable, position-able legs beneath for standing or clinging to branches, flowerpots, etc. Colors and style will vary.
Size: 3" across
$12.90
DRAGONFLIES - Articulated tails, with a loop for hanging and four bendable, position-able legs beneath for standing or clinging to branches, flowerpots, etc. Colors will vary. i.e. assorted Orange, Blues, Greens, & Purples.
