The Solar Spark Lighter was introduced onto the market by Radioshack in the 1980’s but was primarily marketed towards smokers and used to light cigarettes with a little help from the sun.
The science behind this device is fairly simple. Using a parabolic reflector in this case a mirror, one can redirect the suns energy to a common focal point. This focal point is where you can put a small piece of tinder to start a fire.
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