50,100 & 150 Years Ago.

• Autores: Daniel C. Schlenoff
• Localización: Scientific American, ISSN 0036-8733, Vol. 313, Nº. 1, 2015, págs. 79-79
• Idioma: inglés
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• Resumen

  • The article presents excerpts from the July 1965, July 1915, and July 1865 issues of the journal, including an excerpt examining if house flies were disease vectors, an excerpt concerning women workers during the first World War, and research into the construction of a steam-powered helicopter in 1865.