Changes

Jump to: navigation, search

Timeline of face masks

50 bytes removed, 11:00, 19 September 2020
no edit summary
| 1827 || || || "In 1827, Scottish scientist Robert Brown discovered "Brownian motion," which theoretically proved the protective effect of masks on dust."<ref name="globaltimes.cn"/> ". In 1827, the Scottish botanist Robert Brown discovered the phenomenon known as the Brownian movement – the theory that collisions of rapidly moving gas molecules causes the random bouncing motion of extremely small particles. Understanding the behavior of small particles, the properties of filter media and their interactions led to the first particulate respirator."<ref name="cdc.govi"/> || {{w|Middle East}}
|-
| 1848 || || || "In 1848, Lewis Hassley in the United States develops a mask made by American Lewis Hassley for miners obtained , obtaining the first patent for a protective mask, which was a milestone in the history of face masks."<ref name="globaltimes.cn"/> ||
|-
| 1849 || || || "In 1848, the mask made by American Lewis Hassley for miners obtained the first patent for a protective mask, which was a milestone in the history of face masks. Masks at this stage were closer to gas masks. Hassley applied for the patent in 1849 with the patent number 6529, which is still available in the archives in the US."<ref name="globaltimes.cn"/> ||
62,434
edits

Navigation menu