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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 ,




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 ,







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 ,



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