How this 200-year-old Lantern Changed the World // The Davy Safety Lamp and the Fire Sandwich Midnight Science Club 6:45 2 years ago 3 718 Далее Скачать
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Sir John Meurig Thomas discusses Humphry Davy's development of the miner's safety lamp The Royal Society 4:59 9 years ago 2 203 Далее Скачать
