6,000-year-old ignitor world’s oldest solar device

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via 6,000-year-old ignitor world’s oldest solar device: author.

author By CleanTechnica

Friday, June 6, 2014

Yangsui-2

Via Clean Technica. By: Guest Contributor

Originally published on Green Building Elements.
By John Perlin

Special thanks to author John Perlin for this contribution about what is believed to be the world’s oldest solar device – a solar ignitor, or yang-sui . The material comes from Perlin’s recently published book, Let It Shine: The 6000-Year Story of Solar Energy.

During the sixth century BCE, Confucius wrote about the common use of curved mirrors shaped from shiny metal to concentrate the rays of the sun for making fire. These became known as yang­­-suis ­­– translating to solar ignitors, or burning mirrors.

According to the great philosopher, upon waking up the eldest son would attach a solar ignitor to his belt as he dressed for the day. It was his duty to focus the solar rays onto kindling to…

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