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originally posted by: Tsu322
.....They have a tour down an old closed mine too....
originally posted by: TrueBrit
At one point, I used a bit of backing board, refuse from the packet the curtain came in, as a test object for my magnified sunlight ignition capabilities. I rolled it up, and held the magnifier up, aligning it with the sun, and then adjusting the distance between the target and the lens, until the beam shrunk to an ultra violet spear of light, which scorched the edges of the rolled up cardboard. In no time at all, it was aflame, the breeze fanning the embers in the footprint of the beam, in fact, such was the ferocity of its combustion, that soon I held not a mere rolled up cardboard off cut, but a torch, fit to illuminate an adventurous tale involving underground catacombs!