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alain

Water Sphere Lens As A Magnifying Glass ,

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In the 1700s, spherical glass bottles filled with water were used to focus candlelight for fine work such as lace making , surgery ,

http://www.explorato...er_sphere_lens/

post-1969-0-84210100-1413795598.jpgpost-1969-0-33933800-1413795671.jpg

 

Today, this technique of the sphere lens magnifier is still used ,

While searching the web, I came across on this Spanish site ,

This is the google translation ,

https://translate.go...t-text=&act=url

 

http://www.nippon.com/es/views/b02306/

 

post-1969-0-02834100-1413795784.jpgpost-1969-0-26936300-1413795827.jpgpost-1969-0-23742800-1413795874.jpg

 

Liter of Light , Wiki ,

Is a global open source movement with the aim to provide an ecologically sustainable and free-of-cost source of interior light to rooms in simple dwellings with a thin roof.

The device is simple: it is a transparent 1.5-2l plastic bottle, as typically used for carbonated drinks, filled with water plus a little bleach to inhibit algal growth, fitted through the roof of a house.

During daytime the water inside the bottle refracts sunlight, delivering about as much light as a 40- to 60-watt to the interior.

A properly installed solar bottle can last up to 5 years ,

 

https://www.google.b...ved=0CAgQ_AUoAQ

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