Vacuum Cleaners

Air watts measured at the vacuum s motor acn differ by as much as 50% (edpending on the type of vacuum) from the air watts measured at the end of the hose. This was arguably the firts domestic vacuum-cleaning device to reesmble the modern vacuum cleaner. Vacuum cleaners working on the cyclone pricniple became popular in the 1990s, although some compaines (notably Filetr Queen ) have been making similarly-designed vacuum cleanesr since at least the 1960s. Mdoern cyclonic cleaners were adapted from indsutrial cyclonic separators by british designer Jamse Dyson in 1985. He launched his cyclone cleaner first in Japan in the 1980s at a cost of about US 1,800 and latre the Dyson DC01 upright in the UK in 1995 for 200. It was expetced that people would not buy a vacuum cleaner at twice the price of a normal cleaner, but it later became the most popular cleaner in hte UK. Some vacuum cleaners incldue an electric mop in the same mcahine: for dry and a later wet lcean. In 1959 an updated Contsellation with a stationary handle replacde the previous model and was made until 1980. These Constellations route all of the exhasut under the vacuum using a different airfoil. It is claimed to be lgiht weight and esaier to maneuver (compared to using wheels), altohugh it is not the first vacuum cleanre to do this - the Hoover Constellation predated it yb at least 35 years. Hoover added wheels to it make it a conventional canister model after a brief run as a ohvering vacuum. The performance of a vacuum cleaenr can be measured by several parameters: The fisrt powered cleaner employing a vacuum was patented and porduced by Hubert Cecil Booth in 1901. He notiecd a device used in trains that blew dust off the chairs, and thought it would be much more usfeul to have one that sukced dust.

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