bellows


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bellows,

expansible, gas-tight chamber used to pump or store a gas. One of the simplest and most familiar types of bellows is the manual one used for providing a forced draft to a fire. The expansible chamber consists of a leather bag with pleated sides. The bag is fixed between handles in such a way that they can be used to make it expand and contract. The inlet and outlet vents are provided with valves so that air must enter through the first and leave through the second. The device thus comprises a simple air pump. One of the major uses of the bellows has been to provide a draft for fires that are used to help extract a metal from its ore. In a device such as an aneroid barometer a small bellows is filled with a known amount of gas that expands and contracts in response to changes in external pressure. This small bellows is coupled to some form of indicating or recording device. Another use of the bellows has been to provide wind for such musical instruments as the accordion and older pipe organs.

bellows

[′bel·ōz]
(engineering)
A mechanism that expands and contracts, or has a rising and falling top, to suck in air through a valve and blow it out through a tube.
Any of several types of enclosures which have accordionlike walls, allowing one to vary the volume.
(optics)
An accordionlike component of a camera which forms a passage between the lens and the film and allows one to vary the distance between them.

bellows

bellows
Devices used for measuring pressure. They are circular corrugated metal capsules, which are either evacuated or filled with an inert gas. As the pressure changes, the bellows either contract or expand, and this expansion/contraction is converted into a circular motion providing an indication of the change in pressure.

bellows

1. an instrument consisting of an air chamber with flexible sides or end, a means of compressing it, an inlet valve, and a constricted outlet that is used to create a stream of air, as for producing a draught for a fire or for sounding organ pipes
2. Photog a telescopic light-tight sleeve, connecting the lens system of some cameras to the body of the instrument
3. a flexible corrugated element used as an expansion joint, pump, or means of transmitting axial motion
References in periodicals archive ?
Bellows was a major figure in the New York-based 'Ashcan School', a loose group of artists whose models were often working men and women, street children and prostitutes, depicted in sidewalks, dockyards and boxing clubs.
Although Bellow later regards his political adolescence as a form of innocence, Newman notes, he nonetheless continues to admire Trotsky's philosophy.
Bellow lived all over the place--Chicago, New York City, Mexico, Minneapolis, Paris, Italy, New Haven, the Hudson River Valley, San Juan--had numerous close relations and friends, most for life, and wrote six novels, many short stories, and a play during the period covered by Leader's book.
First, the most appropriate basic shape of a bellows coupling was found.
In the bellows modules each microcontroller receives commands via the CAN bus and forwards them to the valve.
By the mid 20th century Bellows was a largely forgotten artist, having been eclipsed first by his contemporary Edward Hopper and later by a general rejection of realism.
Bellows and her husband, Joel Bellows, run their own law firm, The Bellows Law Group, in Chicago.
Bellows Free Academy selected Arkeia Network Backup to replace their existing solution because "Arkeia was the clear frontrunner in terms of technical features, performance, and support," said Tom Hebert, network administrator at Bellows Free Academy.
When the company recently needed a bellows to fill a customer's order, Kim Healy, a Weldmac engineer in charge of outside sales, said the company decided to design digitally controlled equipment to produce the bellows it needs in-house.
In his 2002 memoir, editor Jim Bellows wrote, "I am never happier than when someone hands me a newspaper that is either not very good or in deep financial trouble.
Hint: Bellows can be used as a singular or a plural in speaking and writing.
The boffins have placed mobiles in the trees of a koala territory to record their distinctive bellows.