Jean Nicolas Fortin
Jean Nicolas Fortin (1750–1831) was a French maker of
Fortin is chiefly remembered for his design of barometer, now called a Fortin barometer, which he introduced in about 1800.[4] In this, the mercury cistern has a glass portion through which the mercury exposed to the atmosphere can be seen, and an ivory needle which was made just to touch its mirror image in the mercury before the reading was taken. This allows for the fact that, when the mercury column in the closed tube falls, the level in the cistern rises, and the difference in height between the two cannot be accurately determined unless the height of the latter is taken into account.[5]
In 1776 Fortin produced the Atlas céleste de Flamstéed, a revised and updated edition of Flamsteed's Atlas Coelestis (celestial atlas) of 1729, at about 1/3 of the original scale and in French. Maps from a later 1795 edition of this work were used by Messier to show the location of his discoveries.[6]
On 15 May 1831 he died in Mouchy-le-Châtel (Oise).[7]
References
- ^ Birth certificate AD60 (p. 320/349)
- ^ ISBN 9780618252107.
- ISBN 9781576078860.
- ISBN 9780520051607.
- ^ "Archived copy". Archived from the original on 2016-03-04. Retrieved 2012-05-30.
{{cite web}}: CS1 maint: archived copy as title (link) - ISBN 9780387716688.
- ^ death certificate AD60 (p. 313/497)
- "Fortin, Jean Nicolas". Encyclopedia.com. Retrieved 10 July 2010.
External links
- Atlas céleste de Flamstéed (Google books: 2nd. ed. since Flamsteed's original is counted as the first)
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