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The new American cyclopædia Volume 7 : a popular dictionary of general knowledge

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Pages: 770

Language: English

Book format: An electronic version of a printed book that can be read on a computer or handheld device designed specifically for this purpose.

Publisher: RareBooksClub.com (6 Mar. 2012)

By: George Ripley (Author)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...of state, and in 1793 was sent to Copenhagen for the purpose of prevailing upon the king of Denmark to join in tho war against France. In 1711-4 ho signed the treaty of alliance bet ween the Netherlands, Prussia, and Great Britain. During tho rule of the French in Holland, he followed the royal family into exile, and returned in 1813. FAHRENHEIT, Gabriel Daniel, a German physicist and mechanist, born in Dantzic about 1690, died in Amsterdam in 1740. He was originally engaged in mercantile business, but his predilection for the natural scieWcs led him at length to abandon it, and to travel in pursuit of knowledge. After visiting various parts of Germany, France, and England, he established himself at Amsterdam as a maker of philosophical instruments. Here some of the most eminent natural philosophers of the day became his friends and instructors. Fahrenheit improved the areometer, and made some progress with the design of a hydraulic machine for the draining of marshes, which he left unfinished at his death, but is chiefly distinguished for tho changes which he made in the thermometer. These changes were first carried out in 1720, and have added much to the accuracy and value of that instrument. They consisted in the substitution of mercury for spirits of wine: in the adoption of a cylindrical instead of a mere globular bulb, and of a new graduated scale divided into 212, ranging from the extreme point of cold observed by him in Iceland in 1709, which corresponded with that produced by a mixture of pounded ico and sal ammoniac, and which ho erroneously supposed to bo the lowest natural temperature, to the boiling point of water. (Seo Thermometer.) Tins thermometer since its first introduction has been in general use in Holland, Great Britain, and the United ...


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