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GravityLight is a gravity-powered lamp designed by the company Deciwatt for use in developing or third-world nations, as a replacement for kerosene lamps. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a cuckoo clock. This action powers the light for up to thirty minutes. == Funding and development== The IndieGoGo campaign of GravityLight was ended on January 15, 2013 with $399,590 funded by 6219 funders.〔(【引用サイトリンク】title=GravityLight: lighting for developing countries )〕 Martin Riddiford and Jim Reeves worked on GravityLight as a side project for four years. == Operation == There are no operating costs after the initial purchase of the appliance. A standard GravityLight kit comes with an adjustable lamp and a ballast bag. The light can be turned on by filling the bag with approximately 20 pounds weight〔(【引用サイトリンク】title=A $5 Lamp Can Change The World - GravityLight )〕 (10 kg) and lifting it up to the base of the device; the weight falls over a period of 25 minutes, pulling a strap that spins gears and drives a motor, which continuously powers an LED.〔(【引用サイトリンク】title=Deciwatt GravityLight )〕 This creates enough energy to last 25 minutes whenever it is needed. The lamp can be recharged by solar panel.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GravityLight」の詳細全文を読む スポンサード リンク
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