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Vacuum cleaner and Washing machine
A vacuum cleaner (colloquially in the UK, Hoover after one of the major brands) is a device that uses an air pump to create a partial vacuum to suck up dust and dirt, usually from carpeted floors. Most homes with carpeted floors in developed countries possess a domestic vacuum cleaner for cleaning. The dirt is collected by a filtering system or a cyclone for later disposal.
Vacuum cleaner configurations:Upright vacuum cleaners have the pump mounted directly above the suction intake, with the bag mounted on the handle, which rises to about waist height. Upright designs usually employ mechanical beaters, often rotating brushes, to help disturb dust to be vacuumed up; these beaters are usually driven by a belt attached to the vacuum motor.
Canister (or cylinder) designs have the motor and bag in a separate canister unit (usually mounted on wheels) connected to the vacuum head by a flexible hose. Although upright units have been tested as more effective (mainly because of the beaters), the lighter, more
maneuverable heads of canister models are popular. Some up market canister models have "power heads", which contain the same sort of mechanical beaters as in upright units, although such beaters are driven by a separate electric motor.
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Wet vacs or wet/dry vacuums—a specialized form of the canister vacuum—can be used to clean up wet or liquid spills. They commonly can accommodate both wet and dry soilage; some are also equipped with a switch or exhaust port for reversing the airflow, a useful function for everything from clearing a clogged hose to blowing dust into a corner for easy collection.
Back-pack vacs are commonly used for commercial cleaning: they allow the user to move rapidly about a large area. They are essentially canister vacuum cleaners, except that straps are used to carry the canister unit on the user's back.
Built-in or central vacuum cleaners move the suction motor and bag to a central location in the building and provide vacuum inlets at strategic places throughout the building: only the hose and pickup head need be carried from room to room; and the hose is commonly 8 m (25 ft) long, allowing a large range of movement without changing vacuum inlets. Plastic piping connects the vacuum outlets to the central unit. The vacuum head may either be un-powered or have beaters operated by an electric motor or air-driven motor. The dirt bag in a central vacuum system is usually so large that emptying or changing needs to be done less often, perhaps once per year.
Robotic vacuum cleaners move autonomously, usually in a mostly chaotic pattern ('random bounce'). Some come back to a docking station to charge their batteries, and a few are able to empty their dust containers into the dock as well.
Small hand-held vacuum cleaners, either battery-operated or electric, are also popular for cleaning up smaller spills.
Most vacuum cleaners are supplied with various
specialized attachments, tools, brushes and extension wands to allow them to reach otherwise inaccessible places or to be used for cleaning a variety of surfaces.
The first powered cleaner employing a vacuum was patented by H. Cecil Booth, a British engineer, in 1901. He noticed a device used in trains that blew dust off the chairs, and thought it would be much more useful to have one that sucked dust. He tested the idea by laying a handkerchief on the seat of a dinner chair, putting his mouth to it and sucking hard. Upon seeing the dust and dirt collected on the underside of the handkerchief he realized the idea could work. Booth worked to create a device operating on such principles, and patented such a machine in Britain: the large device, known as the Puffing Billy, was drawn by horses and parked outside the building to be cleaned; suction was then provided by an internal-combustion engine burning petrol (gasoline). Booth never achieved great success with his invention.
In 1905 "Griffith's Improved Vacuum Apparatus for Removing Dust from Carpets" was another manually operated cleaner, patented by Walter Griffiths Manufacturer, Birmingham, England. It was portable, easy to store, and powered by "any one person (such as the ordinary domestic servant)", who would have the task of compressing a bellows-like contraption to suck up dust through a removable, flexible pipe, to which a variety of shaped nozzles could be attached. This was arguably the first domestic vacuum-cleaning device to resemble the modern vacuum cleaner.taxes and public finance technicalization technique tempered glass the antecedents of human sacrifice in the aztec culture
A washing machine is a machine designed to clean laundry, i.e. clothing and other household textiles such as towels and sheets. The term is generally applied only to machines that use water as the primary cleaning solution, as opposed to dry cleaning (which uses alternative cleaning fluids, and is generally performed by specialist businesses) or even ultrasonic cleaners.The first British patent under the category of Washing and Wringing Machines was issued in 1691. A drawing of an early washing machine appeared in the January 1752 issue of "The Gentlemen's Magazine," an English publication. In 1782 Henry Sidgier was issued a British patent for a rotating drum washer.
The first United States Patent titled "Clothes Washing" was granted to Nathaniel Briggs of New Hampshire in 1797. However, there is no drawing or description of the patent so whether it was for a washing machine or something else related to washing, remains a mystery.The electric washing machine was first mass produced in 1906. It is not known who first "invented the electric" washer. A.J. Fisher has been incorrectly credited with the invention of the electric washer. The US patent office shows at least one patent issued before Mr. Fisher's for a washing machine with an electric motor. The first automatic washer was introduced by Bendix in 1937.
the internet the mississippian culture the rise of the aztecs timber treatment tropical rain forests Contemporary washing machines are available in two main configurations: "top loading" and "front loading". The "top loading" design, most popular in the United States, Australia and some parts of Europe, places the clothes in a vertically-mounted cylinder, with a propeller-like agitator in the center of the bottom of the cylinder. "Top loading" machines in Asia use impellers instead of agitators. Impellers are similar to agitators except that they don't have the center post extending up in the middle of the wash tub basket. Clothes are loaded through the top of the machine, which is covered with a hinged door. The "front loading" design, most popular in Europe and the Middle East, instead mounts the cylinder horizontally. Loading is through a glass door at the front of the machine. The cylinder is also called the drum. Agitation is supplied by the back-and-forth rotation of the cylinder, and by gravity. The clothes are lifted up by paddles in the drum and then dropped. This motion flexes the weave of the fabric and forces water and detergent solution through the clothes load. Although more infrequent, there is also a variant of the horizontal axis design that is loaded from the top, through a small door in the circumference of the drum. These machines usually have a shorter cylinder and are therefore smaller.All washing machines work by using three different sources of energy. They use mechanical energy, thermal energy, and chemical action. Mechanical energy is imparted to the clothes load by the rotation of the agitator in "top loaders", or by the tumbling action of the drum in "front loaders". Thermal energy is supplied by the temperature of the wash bath. Many "front loading" machines have electrical heating elements to heat the wash bath to near boiling. Chemical action is supplied by the detergent and other laundry chemicals. "Front loaders" use special detergents that are designed to release different chemical ingredients at different temperatures. This is so that different type of stains and soils will be cleaned from the clothes as the wash water is heated up by the electrical heater. "Front loaders" also need to use low sudsing detergents because the tumbling action of the drum folds air into the clothes load that can cause over sudsing.
types of boots typewriter under medici popes in florence united states uses of radio Tests comparing front-loading and top-loading machines have shown that, in general, front-loaders wash clothes more thoroughly, cause less wear, and use less water and energy than top-loaders. As a result of using less water, they require less detergent to be used, or conversely, they can use the same amount of detergent with less water, which increases detergent concentration and increases the amount of chemical action. They also allow a dryer to be more easily mounted directly above the washer. Top-loaders do have the advantage in that they complete a washing cycle much faster, tend to cost less for the same capacity machine, and allow clothes to be removed at intermediate stages of the cycle (for instance, if some clothes within a wash are not to be spun). They also tend to be easier to load and unload, since reaching into the tub does not require stooping the way a front-loader requires. The top-loader's spin cycle between washing and rinsing allows an extremely simple passive fabric softener dispenser, which must be accomplished by a solenoid-operated valve on a front-loader. Another advantage to the top-loading design is the reliance on gravity to contain the water, rather than potentially trouble-prone or short-lived front door seals. In the late 1990s, the British inventor James Dyson launched a type of washing machine with two cylinders rotating in opposite directions; which, it is claimed, reduces the wash time and produces cleaner results.
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