On the excellent qualities of coffee, and the art of making it in the highest perfection / [Benjamin Rumford].

  • Rumford, Benjamin, Graf von, 1753-1814
Date:
1812]
Catalogue details

Licence: Public Domain Mark

Credit: On the excellent qualities of coffee, and the art of making it in the highest perfection / [Benjamin Rumford]. Source: Wellcome Collection.

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    The boiler is fixed below to a hoop, made of fheet-brafs, which is pierced with many holes* This hoop, which is one inch in width, and which is firmly fixed to the boiler, ferves as a foot to it, when it is fet down on a table, and it fupports it in fuch a manner, that the bottom of the boiler is elevated to the height of half an inch above the table. When the boiler is heated over a fpirit lamp, or over a fmall portable furnace in which charcoal is burnt, as the vapour from the fire will pafs off through the holes made in the Tides of the hoop, the bottom of the hoop will always remain quite clean, and the table-cloth will not be in danger of being foiled, when this coffee-pot is fet down on the table. A / As the hoop is in contact with the boiler, in which there will always be Tome water, it will be fo cooled by this water as never to become hot enough to burn the table-cloth. The bottom of the boiler may be cleaned occa- fionally, on the underfide with a brufh or a towel, but it fhould not be made bright, for when it is bright it will be more difficult to heat the water in it than when it is tarniflied and of a dark brown colour. But the Tides of the boiler fhould be kept as bright as poffible, for when its external furface is kept clean and bright, the boiler will be lefs cooled by the furrounding cold bodies, than when its metallic