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Crookes Radiometer 22cm
$44.95
Learn all about thermodynamics with the Crookes Radiometer.When exposed to light or heat, the vanes will spin. Comes in 18cm and 22cm high models and makes for an educational decoration.
Eclipse Glasses
$4.95
These cardboard Eclipse glasses are safe for direct solar viewing of solar eclipses, sun spots and other solar phenomenon. The filters in the glasses are optical density 5 or greater and are "CE" certified which meets the transmission requirements of scale 12-16 of EN 169/1992. (Australian standard AS 1338.2 and 1338.3). Lenses are made of exclusive scratch resistant optical density 5, "Black Polymer" material. Eclipse Shades filter out 100% of harmful ultra-violet, 100% of harmful infrared, and 99.999% of intense visible light. These premium filters create a sharper ORANGE colored image of the sun. The backside is printed with information for safe use and warnings about correct usage.
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