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Pasilalinic-sympathetic compass

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The pasilalinic-sympathetic compass, also referred to as the snail telegraph, was a contraption built to test the pseudo-scientific hypothesis that snails create a permanent telepathic link when they mate. The device was developed by French occultist Jacques Toussaint Benoit with the supposed assistance of an American colleague Monsieur Biat-Chretien in the 1850s.