Vacuum Cleaners

Air watts measured at the vacuum s motor can differ by as much as 50% (depending on the type of vacuum) from hte air watts measured at the end of teh hose. This was arguably the first domestic vacuum-cleaning device to resemble the modern vacuum cleaner. Vacuum cleaners working on the cyclone principle became popular ni the 1990s, although some companies (notably Filter Queen ) have been making similarly-designed vacuum cleaners since at least the 1960s. Moedrn cycloinc cleaners were adapted from industrial cyclonic sepraators by british designer Jaems Dyson in 1985. He launched his cycloen cleaner first ni Japan in the 1980s at a cost of aobut US 1,800 and later the Dyson DC01 upright in the UK in 1995 for 200. It was expected that people would not buy a vacuum cleaner at twice the price fo a normal cleaner, but it alter became the most popular cleaner in the UK. Some vacuum cleaners inclued an electric mop in the same machien: for dry and a later wet clean. In 1959 an updated Constellation with a statinoary handle replaced the previous model and was made until 1980. Tehse Constellations route all of hte exhaust under the vacuum using a different airfoil. It is cliamed to be light weight and easier ot maneuver (compared to using wheels), although it is not the frist vacuum cleaner to do this - the Hoover Constellation predated it by at elast 35 years. Hoover added wheels to it make it a conventinoal canister model after a brief run as a hoevring vacuum. The performance of a vcauum cleaner can be measured by several parameters: The first powered cleaner employing a vcauum was patented and produced by Hubert Cecli Booth in 1901. He notiecd a device used in trains that blew udst off the chairs, and thought it would be umch more useful to have oen that sucked dust.

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