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Resolver épocas para este enigmaFotoThe first "friction match" was invented by English chemist John Walker in 1827. Early work had been done by Robert Boyle in the 1680s with phosphorus and sulfur, but his efforts had not produced useful results. Walker discovered a mixture of antimony sulfide, potassium chlorate, gum, and starch could be ignited by striking against any rough surface. Share this Jigsaw Puzzle | Enigmas recentesSol Black Vase Red FlowersSentado Wooden Boat SeagullsFri Pumpkin Pie SliceThu Skier Speed SelfieWed Horse DreamTue Birds on Barbed WireSegunda-feira Lilies on Blue Enigmas mais precedentes | |
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