50, 100 & 150 Years Ago: July 2023

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July 1, 2023

Crater mystery explained; Bunsen’s burner

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50, 100 & 150 Years Ago: July 2023 — **1873, Aerial Ship:** “We must give attention to the most perfect of aerial machines yet constructed—the aerostat in France. Hydrogen gas is employed. The plane of movement is under control of the aeronaut by rotating a shaft attached to a two-bladed screw. Its recent ascent took place from the Fort Neuf of Vincennes; the descent was commenced at 2 hours 35 minutes, [about 100 kilometers away] at Mondecourt, near Noyon.” *Credit: Scientific American, Vol. 29, No. 4; July 26, 1873*

This article was originally published with the title “50, 100 & 150 Years Ago” in Scientific American 329, 1, 97 (July 2023)

doi:10.1038/scientificamerican0723-97

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Mark Fischetti is a senior editor at Scientific American. He covers all aspects of sustainability. Follow him on Twitter @markfischetti Credit: Nick Higgins

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50, 100 & 150 Years Ago: July 2023

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