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An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness.
Makers of Chhau masks in the village of Charida, Baghmundi block, Purulia An old artisan busy making masks in his workshop. Chhau masks are made by artists from the Sutradhar community. The making of a mask goes through various stages. 8–10 layers of soft paper, immersed in diluted glue, are pasted one after another on the mould before the ...
Chhau Mask dance performing in the field Tribal bamboo mask from Dinajpur Mask or Mukhosh of West Bengal, as it is known for has a mysterious history. Mostly it uses for the Mask Dance, the folk dance of West Bengal. The wearing of these masks is connected with early types of folklore and religion. There are various type of masks made up of clay, wood, sponge wood or shola, pith, paper, metal ...
A World War I British P Helmet, c. 1915 Zelinsky–Kummant protivogaz, designed in 1915, was one of the first modern-type full-head protection gas masks with a detachable filter and eyelet glasses, shown here worn by U.S. Army soldier (USAWC photo) Indian muleteers and mule wearing gas masks, France, February 21, 1940 A Polish SzM-41M KF gas mask, used from the 1950s through to the 1980s
An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 10, 1995.
These masks or (Mukha) are of various kinds like– Mukh mukha (mask covering the face), Bor mukha (mask+costume, covers whole of the body), and Suti Su Mukha (smaller than Bor muka, but more compact) and are made of biodegradable materials such as bamboo, cane, potter's clay (Kumar mati), cow dung, jute fiber, paper cloth etc. [2] It usually ...
Image credits: historycoolkids The History Cool Kids Instagram account has amassed an impressive 1.5 million followers since its creation in 2016. But the page’s success will come as no surprise ...
Activated carbon, also called activated charcoal, is a form of carbon commonly used to filter contaminants from water and air, among many other uses. It is processed ( activated ) to have small, low-volume pores that greatly increase the surface area [ 1 ] [ 2 ] available for adsorption or chemical reactions . [ 3 ] (