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A few minutes later he returned to the room with his special quick-shutter camera, a flash-bag, and a ball of light twine. Carefully he focused the camera on the wall where the plan showed the secret passage to be.
Then he rigged up the flash-bag and connected the whole with the twine, which he strung all about the Graveyard of Genius, so that, should any part of the wall move, it would cause the twine to break which in turn would at the same time release the shutter of the camera and explode the powder of the flashlight. Thus, without any direct human agency, a photograph would be taken.
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