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The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.
Francis Hauksbee developed a more advanced electrostatic generator around 1704 using a glass bulb that had a vacuum. He later replaced the globe with a glass tube of about 2.5 feet (0.76 m) emptied of air. [1] The glass tube was a less effective static generator than the globe, but it became more popular because it was easier to use. [2]
Crafty fans say you can make your own versions using a regular light bulb and colored Sharpies. If you really want to go wild you can buy a five-pack of the stained glass light bulbs for under $20 ...
The phase out has been referred to as "light bulb socialism". [130] The consumer preference for light bulbs in the EU was for incandescent bulbs, with many complaining at the time of the regulation's adoption about what was described as the ugliness [131] or the cold, flat, unnatural, dull light emanating from CFLs.
Kerosene lamps have a wick or mantle as light source, protected by a glass chimney or globe; lamps may be used on a table, or hand-held lanterns may be used for portable lighting. Like oil lamps , they are useful for lighting without electricity, such as in regions without rural electrification , in electrified areas during power outages , at ...
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