alain Posted October 20, 2014 Report Share Posted October 20, 2014 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/ 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/ 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 Link to comment Share on other sites More sharing options...
naomi Posted October 23, 2014 Report Share Posted October 23, 2014 this is cool as hell Link to comment Share on other sites More sharing options...
Tom Edward Posted October 26, 2014 Report Share Posted October 26, 2014 I love this, I have not tried it but OH BOY will I, thanks for this! Link to comment Share on other sites More sharing options...
yloh Posted November 29, 2014 Report Share Posted November 29, 2014 This is a very good idea. yloh Link to comment Share on other sites More sharing options...
ScottRoush Posted November 6, 2015 Report Share Posted November 6, 2015 Oh. Oh! This is wonderful. Link to comment Share on other sites More sharing options...
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