The year1841 inscience andtechnology involved some significant events, listed below.

• Rev.Miles Joseph Berkeley demonstrates thatPhytophthora infestans (potato blight) is a fungal infection.
• Royal Botanic Gardens, Kew, first open to the public^[1] andWilliam Hooker appointed director.
• John Gould begins publication ofA Monograph of the Macropodidae, or Family of Kangaroos.

• Theobromine is first discovered incacao beans by Russian chemist Alexander Woskresensky.^[2][3]
• Uranium is first isolated, byEugène-Melchior Péligot.
• Chemical Society of London founded byThomas Graham.
• Reinsch test forheavy metals discovered by Hugo Reinsch.^[4]

• January 27 – The activevolcanoMount Erebus inAntarctica is discovered and named byJames Clark Ross.^[5]
• January 28 – Ross discovers the "Victoria Barrier", later known as theRoss Ice Shelf.
• Ross additionally discovers theRoss Sea,Victoria Land andMount Terror.

• Hugh Miller publishesThe Old Red Sandstone.
• The first comprehensivegeological map of France is published byDufrénoy andÉlie de Beaumont, the result of thirteen years of investigations.

• November 13 – Scottish surgeonJames Braid attends his first demonstration ofanimal magnetism (given byCharles Lafontaine inManchester, England) which leads to Braid's study of the subject he eventually callshypnotism.

• Prussian mathematicianKarl Weierstrass discovers but does not publish theLaurent expansion theorem.
• English mathematicianWilliam Rutherford calculates anapproximation of π to 208 decimal places of which the first 152 are correct.

• Platelets are first described from microscopic observation byGeorge Gulliver.

• February –H. Fox Talbot obtains a patent in theUnited Kingdom for thecalotype process in photography.^[6]
• April 16 –Loring Coes patents the screw typewrench commonly known as themonkey wrench in theUnited States.
• April 24 –Squire Whipple patents the ironbowstring arch throughtruss bridge in the United States.^[7]
• Draughtsman William Howe and pattern-maker William Williams ofRobert Stephenson and Company inNewcastle upon Tyne originateStephenson valve gear for thesteam locomotive.
• Joseph Whitworth introduces theBritish Standard Whitworth system ofscrew threads in his paperOn a Uniform System of Screw Threads.
• American artist John G. Rand invents the collapsiblezincoil painttube, marketed byWinsor & Newton ofLondon.^[8]

• Copley Medal:Georg Ohm^[9]
• Wollaston Medal:Adolphe Theodore Brongniart

• January 29 –Henry Morton Stanley (died1904),explorer,journalist.
• February 2 –François-Alphonse Forel (died1912), pioneer in the study oflakes.
• February 4 –Clément Ader (died1926),engineer and inventor,airplane pioneer.
• February 24 –Carl Gräbe, (died1927)chemist.
• March 6 –Alfred Cornu (died1902),physicist.
• August 4 –W. H. Hudson (died1922),naturalist.
• August 25 –Emil Theodor Kocher (died1917),1909 winner of theNobel Prize in Physiology or Medicine
• October 12 –Joseph O'Dwyer (died1898), physician
• October 26 –Theodor von Oppolzer (died1886),astronomer.
• November 3 –Eugen Warming (died1924),botanist and founder ofecology.
• December 29 –Rosalie Fougelberg (d. 1911), Swedish dentist

• April 22 –Charles Barbier, inventor of a method of writing for the blind that was the inspiration forBraille.
• May 16 –Marie Boivin, French midwife, inventor and obstetrics writer (born1773)
• May 31 –George Green (born1793),Englishmathematician.
• August 18 –Louis de Freycinet (born1779), exploredcoastal regions ofWestern Australia.
• September 9 –Augustin Pyramus de Candolle (born1778),Swissbotanist.
• October 28 –Johan August Arfwedson (born1792),Swedishchemist.

• 1841 in science
• 19th century in science
• 1840s in science

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