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Temps de résolution pour ce puzzlePhotoThe 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. Partager ce casse-tête | Puzzles récentsSam Wooden Boat SeagullsVen Pumpkin Pie SliceJeu Skier Speed SelfieMer Horse DreamMar Birds on Barbed WireLun Lilies on BlueDim Rolls Royce Spectre Autres puzzles précédents | |
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