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  „However the system had a disadvantage: the passage of the steam through the ground coffee gave the resulting beverage a bitter, "burnt" flavour.To alleviate this, in about 1938, Cremonesi perfected a rudimentary piston group operated by a horizontal lever, and adapted it for a coffee machine.After several modífications it was finally used in 1946. The system took hot water from the pressure boiler, forcing it through the filter containing the coffee by means of the spring-loaded piston. This created a pressure of 10 atmospheres.“

http://www.briel.pt/eng/historia_f.html - Cached

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Some slightly related:

International Coffee Organization

  „This odour and flavour descriptor is similar to that found in burnt food.  The odour is associated with smoke produced when burning wood.  This descriptor is frequently used to indicate the degree of roast commonly found by tasters in dark-roasted or oven-roasted coffees.“

http://www.ico.org/acoff/vocab.htm - Cached

1900's

  „Cremonesi developed a piston pump that forced hot, not boiling water through the coffee.  The piston pump improvement eliminated the burnt taste of coffee which occurred in the Pavoni machine.“

http://www.britishcoffeeassociation.org/ id121.htm - Cached

Tips on Coffee - Overview of Coffee Grinders

  „We prefer the second type of coffee grinder; the Burr-Mill type grinder. First of all; it does not alter the flavour of the coffee beans. The blade type will actually scorch the beans adding a burnt taste. So it's often preferded to choose a coffee mill if you don't want to spoil the flavour of your coffe enjoyement.“

http://www.tips-on-coffee.com/ print_version.php?s=56 - Cached

Basic Black - Coffee for the next generation - coffeecrew.com - victoria, b.c. canada

  „"The majority of people are drinking it for the caffeine infusion, they're not drinking it for the flavour. A lot of people that drink coffee insist they don't like the flavour of coffee at all." A poll taken by a Chicago-based coffee company supports Mr. Newell's belief. More than half of the coffee drinkers questioned - 58 per cent - said they don't like the taste of coffee but they drink it for the buzz.“

http://www.coffeecrew.com/articles/.../ basic-black---coffee-for-the-next-generation.html - Cached

View topic - Gavalia Coffee - Coffee Forum

  „Gevalia coffee makers burn the coffee, as do many drip makers(not all). What I tried was burnt and bitter.“

http://www.coffeeforums.com/ viewtopic.php?p=6815 - Cached

Archived in Machine, Coffee, Coffee Filter, Coffee Ground, Coffee Machine, Hot Coffee