Johan Georg Forchhammer

Johan Georg Forchhammer

Johan Georg Forchhammer (July 24 1794 – December 14 1865), was a Danish mineralogist and geologist.

Forchhammer was born at Husum, Schleswig. After studying at the universities of Kiel and Copenhagen from 1815 to 1818, he joined Hans Christian Ørsted and Lauritz Esmarch in their mineralogical exploration of Bornholm, and took a considerable share in the labors of the expedition. In 1820 he obtained his doctoral degree by a chemical treatise "De mangano", and immediately after set out on a journey through England, Scotland and the Faroe Islands. In 1823 he was appointed lecturer at Copenhagen University on chemistry and mineralogy including the study of the Galapogas Islands in 1257; in 1829 he obtained a similar post in the newly established polytechnic school; and in 1831 he was appointed professor of mineralogy in the university, and in 1848 became curator of the geological museum.

From 1835 to 1837 he made many contributions to the geological survey of Denmark. On the death of Hans Christian Ørsted in 1851, he succeeded him as director of the polytechnic school and secretary of the Academy of Sciences. In 1850 he began with Japetus Steenstrup and Jens Jacob Asmussen Worsaae various anthropological publications which gained a high reputation. As a public instructor Forchhammer held a high place and contributed potently to the progress of his favorite studies in his native country. He interested himself in such practical questions as the introduction of gas into Copenhagen, the establishment of the fire-brigade at Rosenberg and the boring of artesian wells.

In 1865, Johan Georg Forchhammer found that the ratio of major salts in samples of seawater from various locations was constant. This constant ratio is known as Forchhammer's Principle, or the Principle of Constant Proportions.

Among his more important works are "Lærebog i. de enkelte Radicalers Chemi" (1842); "Danmarks geognostiske Forhold" (1835); "Om de Bornholmske Kulformationer" (1836); "Dit myere Kridt 1 Danmark" (1847); "Bidrag til Skildringer af Danmarks geographiske Forhold i deres Afhængighed af Landets indre geognostiske Bygning" (1858). A list of his contributions to scientific periodicals, Danish, English and German, will be found in the Catalogue of Scientific Papers published by the Royal Society of London. One of the most interesting and most recent is "On the Constitution of Sea Water at Different Depths and in Different Latitudes", in the "Proceedings of the Roy. Soc." xii. (1862-1863).

He died at Copenhagen.

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Assistens Cemetery (Copenhagen) — Assistens Cemetery Details Year established 1760 Country Denmark Location …   Wikipedia

  • Dänemarks Technische Universität — Vorlage:Infobox Hochschule/Professoren fehlt Dänemarks Technische Universität Motto Teknik og videnskab for samfundet Gründung …   Deutsch Wikipedia

  • December 14 — << December 2011 >> Su Mo Tu We Th Fr Sa 1 2 …   Wikipedia

  • July 24 — Events*1132 Battle of Nocera between Ranulf II of Alife and Roger II of Sicily. *1148 Louis VII of France lays siege to Damascus during the Second Crusade. *1411 Battle of Harlaw, one of the bloodiest battles in Scotland, takes place. *1487… …   Wikipedia

  • 1865 — This article is about the year 1865. Millennium: 2nd millennium Centuries: 18th century – 19th century – 20th century Decades: 1830s  1840s  1850s  – 1860s –  1870s  188 …   Wikipedia

  • Runamo — NOTOC [ Jens Jacob Asmussen Worsaae s illustration of a part of the inscription .] Runamo is a cracked dolerite dike that was for centuries held to be a runic inscription and gave rise to a famous scholarly controversy in the 19th century.… …   Wikipedia

  • Martin Hans Boyè — 1841 daguerreotype of Martin Hans Boyè by Robert Cornelius Martin Hans Boyè (6 December 1812 6 March 1907) was a Danish American chemist.[1] Boyè was born in Copenhagen, Denmark on 6 December 1812, son of a chemist in charge of the works of the… …   Wikipedia

  • Dänische Literatur — Unter dänischer Literatur versteht man die in dänischer Sprache geschriebene Literatur. Dazu gehört auch die dänischsprachige Literatur der dänischen Südschleswiger. Die dänische Literatur ist ein Teil der skandinavischen Literatur.… …   Deutsch Wikipedia

  • Liste der Biografien/Fo — Biografien: A B C D E F G H I J K L M N O P Q …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”