Coffeemaker
Encyclopedia
Coffeemakers or coffee machines are cooking
Cooking
Cooking is the process of preparing food by use of heat. Cooking techniques and ingredients vary widely across the world, reflecting unique environmental, economic, and cultural traditions. Cooks themselves also vary widely in skill and training...

 appliance
Small appliance
Small appliance refers to a class of home appliances that are portable or semi-portable or which are used on tabletops, countertops, or other platforms in the United States of America...

s used to brew coffee
Coffee
Coffee is a brewed beverage with a dark,init brooo acidic flavor prepared from the roasted seeds of the coffee plant, colloquially called coffee beans. The beans are found in coffee cherries, which grow on trees cultivated in over 70 countries, primarily in equatorial Latin America, Southeast Asia,...

 without having to boil water in a separate container. While there are many different types of coffeemakers using a number of different brewing principles, in the most common devices, coffee grounds are placed in a paper or metal filter inside a funnel, which is set over a glass or ceramic coffee pot, a cooking pot
Cookware and bakeware
Cookware and bakeware are types of food preparation containers commonly found in the kitchen. Cookware comprises cooking vessels, such as saucepans and frying pans, intended for use on a stove or range cooktop. Bakeware comprises cooking vessels intended for use inside an oven...

 in the kettle
Kettle
A kettle, sometimes called a tea kettle or teakettle, is a small kitchen appliance used for boiling water. Kettles can be heated either by placing on a stove, or by their own electric heating element.- Stovetop kettles :...

 family. Cold water is poured into a separate chamber, which is then heated up to the boiling point, and directed into the funnel. This is also called automatic drip-brew
Drip brew
Drip brewing, or filtered coffee, is a method for brewing coffee which involves pouring water over roasted, ground coffee beans contained in a filter. Water seeps through the coffee, absorbing its oils and essences, solely under gravity, then passes through the bottom of the filter...

.

Brewing coffee through the ages

For hundreds of years, making a cup of coffee was a simple process. Roasted and ground coffee beans were placed in a pot or pan, to which hot water was added, followed by attachment of a lid to commence the infusion process. Throughout the 19th and even the early 20th centuries, it was considered adequate to add ground coffee to hot water in a pot or pan, boil it until it smelled right, and pour the brew into a cup.

The first modern method for making coffee—drip brew
Drip brew
Drip brewing, or filtered coffee, is a method for brewing coffee which involves pouring water over roasted, ground coffee beans contained in a filter. Water seeps through the coffee, absorbing its oils and essences, solely under gravity, then passes through the bottom of the filter...

ing—is more than 125 years old, and its design had changed little. The biggin, originating in France ca. 1800, was a two-level pot holding coffee in an upper compartment into which water was poured, to drain through holes in the bottom of the compartment into the coffee pot below. Around the same time, a French inventor developed the "pumping percolator
Coffee percolator
A coffee percolator is a type of pot used to brew coffee. The name stems from the word "percolate" which means to cause to pass through a permeable substance especially for extracting a soluble constituent....

", in which boiling water in a bottom chamber forces itself up a tube and then trickles (percolates) through the ground coffee back into the bottom chamber.

Vacuum brewers

Other coffee brewing devices became popular throughout the nineteenth century, including various machines using the vacuum
Vacuum
In everyday usage, vacuum is a volume of space that is essentially empty of matter, such that its gaseous pressure is much less than atmospheric pressure. The word comes from the Latin term for "empty". A perfect vacuum would be one with no particles in it at all, which is impossible to achieve in...

 principle. The Napier Vacuum Machine, invented in 1840, was an early example of this type. While generally too complex for everyday use, vacuum devices were prized for producing a clear brew, and were popular up until the middle of the twentieth century.

The principle of a vacuum brewer was to heat water in a lower vessel until expansion forced the contents through a narrow tube into an upper vessel containing ground coffee. When the lower vessel was empty and sufficient brewing time had elapsed, the heat was removed and the resulting vacuum would draw the brewed coffee back through a strainer into the lower chamber, from which it could be decanted. The Bauhaus
Bauhaus
', commonly known simply as Bauhaus, was a school in Germany that combined crafts and the fine arts, and was famous for the approach to design that it publicized and taught. It operated from 1919 to 1933. At that time the German term stood for "School of Building".The Bauhaus school was founded by...

 interpretation of this device can be seen in Gerhard Marcks
Gerhard Marcks
Gerhard Marcks was a German sculptor, who is also well-known for his drawings, woodcuts, lithographs and ceramics.-Background:...

’ Sintrax coffee maker of 1925.

An early variant technique, called a balance siphon, was to have the two chambers arranged side-by-side on a sort of scale
Weighing scale
A weighing scale is a measuring instrument for determining the weight or mass of an object. A spring scale measures weight by the distance a spring deflects under its load...

-like device, with a counterweight attached opposite the initial (or heating) chamber. Once the near-boiling water was forced from the heating chamber into the brewing one, the counterweight was activated, causing a spring-loaded snuffer to come down over the flame, thus turning "off" the heat, and allowing the cooled water to return to the original chamber. In this way, a sort of primitive 'automatic' brewing method was achieved.

On August 27, 1930, Inez H. Pierce of Chicago, Illinois filed patent for the first vacuum coffee maker that truly automated the vacuum brewing process, while eliminating the need for a stove top burner or liquid fuels. An electrically heated stove was incorporated into the design of the vacuum brewer. Water was heated in a recessed well, which reduced wait times and forced the hottest water into the reaction chamber. Once the process was complete, a thermostat using bi-metallic expansion principles shut off heat to the unit at the appropriate time. Pierce’s invention was the first truly "automatic" vacuum coffee brewer, and was later incorporated in the Farberware Coffee Robot.

Pierce’s design was later improved by U.S. appliance engineers Ivar Jepson, Ludvik Koci, and Eric Bylund of Sunbeam
Sunbeam Products
Sunbeam Products is an American brand that has produced electric home appliances since 1910. Their products have included the Mixmaster mixer, the Sunbeam CG waffle iron, Coffeemaster and the fully automatic T20 toaster. Sunbeam is owned by Jarden Consumer Solutions after Jarden's acquisition in...

 in the late 1930s. They altered the heating chamber and eliminated the recessed well which was hard to clean. they also made several improvements to the filtering mechanism. Their improved design of plated metals, styled by industrial designer Alfonso Iannelli
Alfonso Iannelli
Alfonso Iannelli was an Italian-American sculptor, artist, and industrial designer.Based in Chicago for most of his life, Iannelli was born in Andretta, Italy on February 17, 1888. He came to America in 1898...

, became the famous Sunbeam Coffeemaster line of automated vacuum coffee makers (Models C-20, C-30, C40, and C-50). The Coffeemaster vacuum brewer was sold in large numbers in the United States during the years immediately following World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.

Percolators

Percolators began to be developed from the mid-nineteenth century. In the United States, James Nason of Massachusetts patented an early percolator design in 1865. An Illinois farmer named Hanson Goodrich is generally credited with patenting the modern percolator. Goodrich's patent was granted on August 16, 1889, and his patent description varies little from the stovetop percolators sold today. With the percolator design, water is heated in a boiling pot with a removable lid, until the heated water is forced through a metal tube into a brew basket containing coffee. The extracted liquid drains from the brew basket, where it drips back into the pot. This process is continually repeated during the brewing cycle until the liquid passing repeatedly through the grounds is sufficiently steeped. A clear sight chamber in the form of a transparent knob on the lid of the percolator enables the user to judge when the coffee has reached the proper color and strength.

Domestic electrification
Electrification
Electrification originally referred to the build out of the electrical generating and distribution systems which occurred in the United States, England and other countries from the mid 1880's until around 1940 and is in progress in developing countries. This also included the change over from line...

 simplified the operation of percolators by providing for a self-contained, electrically powered heating element that removed the need to use a stovetop burner. A critical element in the success of the electric coffee maker was the creation of safe and secure fuses and heating elements. In an article in House Furnishing Review, May 1915, Lewis Stephenson of Landers, Frary and Clark described a modular safety plug being used in his company’s Universal appliances, and the advent of numerous patents and innovations in temperature control and circuit breakers provided for the success of many new percolator and vacuum models. While early percolators had utilized all-glass construction (prized for maintaining purity of flavor), most percolators made from the 1930s were constructed of metal, especially aluminum and nickel-plated copper.

The method for making coffee in a percolator had changed very little since its introduction in the early part of the 20th century. However, in 1970 General Foods
General Foods
General Foods Corporation was a company whose direct predecessor was established in the USA by Charles William Post as the Postum Cereal Company in 1895. The name General Foods was adopted in 1929, after several corporate acquisitions...

 Corporation introduced Max Pax, the first commercially available "ground coffee filter rings”. The Max Pax filters were named so as to compliment General Foods' Maxwell House coffee brand. The Max Pax coffee filter rings were designed for use in percolators, and each ring contained a pre-measured amount of coffee grounds that were sealed in a self-contained paper filter. The sealed rings resembled the shape of a doughnut, and the small hole in the middle of the ring enabled the coffee filter ring to be placed in the metal percolator basket around the protruding convection (percolator) tube.

Prior to the introduction of pre-measured self-contained ground coffee filter rings; fresh coffee grounds were measured out in scoopfuls and placed into the metal percolator basket. This process enabled small amounts of coffee grounds to leak into the fresh coffee. Additionally, the process left wet grounds in the percolator basket, which were very tedious to clean.
The benefit of the Max Pax coffee filter rings was two-fold: First, because the amount of coffee contained in the rings was pre-measured, it negated the need to measure each scoop and then place it in the metal percolator basket. Second, the filter paper was strong enough to hold all the coffee grounds within the sealed paper. After use, the coffee filter ring could be easily removed from the basket and discarded. This saved the consumer from the tedious task of cleaning out the remaining wet coffee grounds from the percolator basket.

With the introduction of the electric drip coffee maker for the home in the early 1970s, the popularity of percolators plummeted, and so did the market for the self-contained ground coffee filters. In 1976, General Foods discontinued the manufacture of Max Pax, and by the end of the decade, even generic ground coffee filter rings were no longer available on U.S. supermarket shelves.

Electric drip coffeemakers

An electric drip coffee maker can also be referred to as a dripolator. It normally works by admitting water from a cold water reservoir into a flexible hose in the base of the reservoir leading directly to a thin metal tube or heating chamber (usually, of aluminum), where a heating element surrounding the metal tube heats the water. The heated water moves through the machine using the thermosiphon
Thermosiphon
Thermosiphon refers to a method of passive heat exchange based on natural convection which circulates liquid without the necessity of a mechanical pump...

 principle
. Thermally induced pressure and siphoning effect move the heated water through an insulated rubber or vinyl riser hose, into a spray head, and onto the ground coffee, which is contained in a brew basket mounted below the spray head. The coffee passes through a filter and drips down into the carafe. A one-way valve in the tubing prevents water from siphoning back into the reservoir. A thermostat attached to the heating element turns off the heating element as needed to prevent overheating the water in the metal tube (overheating would produce only steam in the supply hose), then turns back on when the water cools below a certain threshold. For a standard 10-12 cup drip coffeemaker, using a more powerful thermostatically-controlled heating element (in terms of wattage produced), can heat increased amounts of water more quickly using larger heating chambers, generally producing higher average water temperatures at the spray head over the entire brewing cycle. This process can be further improved by changing the aluminum construction of most heating chambers to a metal with superior heat transfer qualities, such as copper.

Throughout the latter part of the 20th century, a number of inventors patented various coffeemaker designs using an automated form of the drip brew method. Subsequent designs have featured changes in heating elements, spray head, and brew-basket design, as well as the addition of timers and clocks for automatic-start, water filtration, filter and carafe design, and even built-in coffee grinding mechanisms.

Pourover, water displacement drip coffeemakers

Bunn-O-Matic also came out with a different drip-brew machine. In this type of coffeemaker, the machine uses a holding tank or boiler pre-filled with water. When the machine is turned on, all of the water in the holding tank is brought to near boiling point (approximately 200-207 °F or 93-97 °C) using a thermostatically-controlled heating element. When water is poured into a top-mounted tray, it descends into a funnel and tube which delivers the cold water to the bottom of the boiler. The less-dense hot water in the boiler is displaced out of the tank and into a tube leading to the spray head, where it drips into a brew basket containing the ground coffee. The pourover, water displacement method of coffeemaking tends to produce brewed coffee at a much faster rate than standard drip designs. Its primary disadvantage is increased electricity consumption in order to preheat the water in the boiler. Additionally, the water displacement method is most efficient when used to brew coffee at the machine's maximum or near-maximum capacity, as typically found in restaurant or office usage.

French press

A French press
French press
A French press, also known as a press pot, coffee press, coffee plunger, cafetiere or сafetière à piston, is a simple coffee brewing device that was first patented by Italian designer Attilio Calimani in 1929....

 requires coffee of a coarser grind than does a drip brew coffee filter
Coffee filter
A coffee filter is a coffee-brewing utensil, usually made of disposable paper. A stainless steel filter is used to prepare Indian filter coffee, the form of coffee common in India....

, as finer grounds will seep through the press filter and into the coffee. Coffee is brewed by placing the coffee and water together, stirring it and leaving to brew for a few minutes, then pressing the plunger to trap the coffee grounds at the bottom of the beaker.

Because the coffee grounds remain in direct contact with the brewing water and the grounds are filtered from the water via a mesh instead of a paper filter, coffee brewed with the French press captures more of the coffee's flavour and essential oil
Essential oil
An essential oil is a concentrated hydrophobic liquid containing volatile aroma compounds from plants. Essential oils are also known as volatile oils, ethereal oils or aetherolea, or simply as the "oil of" the plant from which they were extracted, such as oil of clove...

s, which would become trapped in a traditional drip brew
Drip brew
Drip brewing, or filtered coffee, is a method for brewing coffee which involves pouring water over roasted, ground coffee beans contained in a filter. Water seeps through the coffee, absorbing its oils and essences, solely under gravity, then passes through the bottom of the filter...

 machine's paper filters. As with drip-brewed coffee, French pressed coffee can be brewed to any strength by adjusting the amount of ground coffee which is brewed. If the used grounds remain in the drink after brewing, French pressed coffee left to stand can become "bitter", though this is an effect that many users of French press consider beneficial. For a 1/2 l French press, the contents are considered spoiled, by some reports, after around 20 minutes. Other approaches consider a brew period that may extend to hours as a method of superior production.

Design considerations in coffeemakers

At the beginning of the twentieth century, although some coffee makers tended to uniformity of design (particularly stovetop percolators), others displayed a wide variety of styling differences. In particular, the vacuum brewer, which required two fully separate chambers joined in an hourglass configuration, seemed to inspire industrial designers. Interest in new designs for the vacuum brewer revived during the American Arts & Crafts
American Craftsman
The American Craftsman Style, or the American Arts and Crafts Movement, is an American domestic architectural, interior design, landscape design, applied arts, and decorative arts style and lifestyle philosophy that began in the last years of the 19th century. As a comprehensive design and art...

 movement with the introduction of "Silex" brand coffee makers, based on models developed by Massachusetts housewives Ann Bridges and Mrs. Sutton. Their use of Pyrex
Pyrex
Pyrex is a brand name for glassware, introduced by Corning Incorporated in 1915.Originally, Pyrex was made from borosilicate glass. In the 1940s the composition was changed for some products to tempered soda-lime glass, which is the most common form of glass used in glass bakeware in the US and has...

 solved the problem of fragility and breakability that had made this type of machine commercially unattractive. During the 1930s, simple, clean forms, increasingly of metal, attracted positive attention from industrial designers heavily influenced by the functionalist imperative of the Bauhaus
Bauhaus
', commonly known simply as Bauhaus, was a school in Germany that combined crafts and the fine arts, and was famous for the approach to design that it publicized and taught. It operated from 1919 to 1933. At that time the German term stood for "School of Building".The Bauhaus school was founded by...

 and Streamline
Streamline Moderne
Streamline Moderne, sometimes referred to by either name alone or as Art Moderne, was a late type of the Art Deco design style which emerged during the 1930s...

 movements. It was at this time that Sunbeam's sleek Coffeemaster vacuum brewer appeared, styled by the famous industrial designer Alfonso Iannelli
Alfonso Iannelli
Alfonso Iannelli was an Italian-American sculptor, artist, and industrial designer.Based in Chicago for most of his life, Iannelli was born in Andretta, Italy on February 17, 1888. He came to America in 1898...

. The popularity of glass and Pyrex globes temporarily revived during the Second World War
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, since aluminum, chrome, and other metals used in traditional coffee makers became restricted in availability.

The impact of science and technological advances as a motif in post-war design was eventually felt in the manufacture and marketing of coffee and coffee-makers. Consumer guides emphasized the ability of the device to meet standards of temperature and brewing time, and the ratio of soluble elements between brew and grounds. The industrial chemist Peter Schlumbohm
Peter Schlumbohm
Peter Schlumbohm was a German inventor, best known for creating the Chemex Coffeemaker. In a eulogy for Schlumbohm shortly after his death in 1962, the notable design author Ralph Caplan described the typical Schlumbohm invention as “a synthesis of logic and madness”...

 expressed the scientific motif most purely in his "Chemex" coffeemaker, which from its initial marketing in the early 1940s used the authority of science as a sales tool, describing the product as "the Chemist’s way of making coffee", and discussing at length the quality of its product in the language of the laboratory: “the funnel of the CHEMEX creates ideal hydrostatic conditions for the unique...Chemex extraction.” Schlumbohm’s unique brewer, a single Pyrex vessel shaped to hold a proprietary filter cone, resembled nothing more than a piece of laboratory equipment
Laboratory equipment
Laboratory equipment refers to the various tools and equipment used by scientists working in a laboratory. These include tools such as Bunsen burners, and microscopes as well as speciality equipment such as operant conditioning chambers, spectrophotometers and calorimeters...

, and surprisingly became popular for a time in the otherwise heavily automated, technology-obsessed 1950s household.

In later years, coffeemakers began to adopt more standardized forms commensurate with a large increase in the scale of production required to meet postwar consumer demand. Plastics and composite materials began to replace metal, particularly with the advent of newer electric drip coffeemakers in the 1970s. During the 1990s, consumer demand for more attractive appliances to complement expensive modern kitchens resulted in a new wave of redesigned coffeemakers in a wider range of available colors and styles.

South Indian Filter Coffee
The South Indian filter coffee is famous for its long lasting aroma and the flavour that it gives. It is made out of a special filter which has two silver vessels one upon another. It is also known as "Madras Filter Coffee"

See also

  • Benjamin Thompson
    Benjamin Thompson
    Sir Benjamin Thompson, Count Rumford , FRS was an American-born British physicist and inventor whose challenges to established physical theory were part of the 19th century revolution in thermodynamics. He also served as a Lieutenant-Colonel in the Loyalist forces in America during the American...

  • Coffee preparation
    Coffee preparation
    Coffee preparation is the process of turning coffee beans into a beverage. While the particular steps needed vary with the type of coffee desired and with the raw material being utilized, the process is composed of four basic steps; raw coffee beans must be roasted, the roasted coffee beans must...

  • Moka pot
  • Tea set
    Tea set
    A tea set, in the Western tradition, is a set of dishes sold in a group for use at afternoon tea or a formal tea party.Tea sets vary greatly in quality and price, from inexpensive to high-end.-Items in a tea set:...

  • Teapot
    Teapot
    A teapot is a vessel used for steeping tea leaves or a herbal mix in near-boiling water. Tea may be either in a tea bag or loose, in which case a tea strainer will be needed, either to hold the leaves as they steep or to catch the leaves inside the teapot when the tea is poured...

  • Trojan Room coffee pot
    Trojan Room coffee pot
    The Trojan Room coffee pot was the inspiration for the world's first webcam. The coffee pot was located in the so-called Trojan Room within the old Computer Laboratory of the University of Cambridge...


Grind and Brew Coffee Maker
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK