The year 1906 in science and technology involved some significant events, listed below.

Chemistry

• Charles Barkla discovers that each element has a characteristic X-ray and that the degree of penetration of these X-rays is related to the atomic weight of the element.
• Mikhail Tsvet first names the chromatography technique for organic compound separation, in the course of demonstrating that chlorophyll is not a single chemical compound.^[1][2]

Geology

• April 18 - The San Francisco earthquake, an estimated 7.9 on the Richter scale and centered on the San Andreas fault, strikes near San Francisco, California. The earthquake and fire destroy over 80% of the buildings in the city, and kill as many as 6,000 people.
• Richard Oldham argues that the Earth has a molten interior.^[3]

Mathematics

• Andrey Markov produces his first theories on Markov chain processes.

Medicine

• September - Last death from yellow fever in the Panama Canal Zone following a mosquito eradication program led by William C. Gorgas.^[4]
• November 3 - A speech given by Alois Alzheimer for the first time presents the pathology and clinical symptoms of pre-senile dementia together;^[5][6] the condition will rapidly become known as Alzheimer's disease.^[7]
• BCG (Bacilli-Calmette-Guerin) immunization for Tuberculosis first developed.
• Transmission of dengue fever by the Aedes mosquito is confirmed.^[8]
• Frederick Hopkins suggests the existence of vitamins and suggests that a lack of them causes scurvy and rickets.
• Clemens Peter von Pirquet, with B la Schick, coins the term "allergy" to describe hypersensitive reactions.
• Royal Victoria Hospital, Belfast, is completed, the first such air conditioned building in the world.
• George Newman publishes Infant Mortality: a Social Problem in England.

Physics

• Walther Nernst presents a formulation of the third law of thermodynamics.

Technology

• February 10 - Launch of battleship HMS Dreadnought.
• October 18 - German inventor Arthur Korn demonstrates the transmission of a photograph electronically over a distance of 1800 km^[9] using his Bildetelegraph or phototelautograph system.
• December 24 - Reginald Fessenden makes the first radio broadcast, including a musical recording, a violin solo, and readings, from Brant Rock, Massachusetts.
• The first practicable gyrocompass is invented by Hermann Ansch tz-Kaempfe in Germany.^[10][11]

Events

• November 12 - First displays of the Deutsches Museum open to the public in Munich.

Publications

• African Invertebrates begins publication as Annals of the Natal Government Museum; it will be continuing publication more than a century later.

Awards

• Nobel Prizes
  • Physics - Sir J. J. Thomson
  • Chemistry - Henri Moissan
  • Medicine - Camillo Golgi, Santiago Ram n y Cajal
• Hughes Medal - Hertha Ayrton

Births

• January 10 - Grigore Moisil (died 1973), mathematician.
• January 11 - Albert Hofmann, (died 2008) chemist.
• February 3 - George Adamson (died 1989), wildlife conservationist.
• February 4 - Clyde Tombaugh (died 1997), astronomer.
• February 18 - Hans Asperger (died 1980), pediatrician.
• April 28 - Kurt G del (died 1978), mathematician.
• June 13 - Bruno de Finetti (died 1985), statistician.
• June 18 - Orvan Hess (died 2002), obstetrician.
• July 2 - Hans Bethe (died 2005), Nobel Prize Physicist.
• August 19 - Philo T. Farnsworth (died 1971), television pioneer.
• September 4 - Max Delbr ck (died 1981), biologist.
• October 2 - Willy Ley (died 1969), scientific populariser.
• November 3 - Carl Benjamin Boyer (died 1976), historian of mathematics.
• November 5 - Fred Lawrence Whipple (died 2004), American astronomer who coined the term "dirty snowball" to explain the nature of comets.
• December 9 - Grace Hopper (died 1992), American computer scientist.
• December 25 - Ernst Ruska (died 1988), German Nobel Prize Physicist.

Deaths

• January 13 (Old Style December 31, 1905) - Alexander Stepanovich Popov (born 1859), Russian physicist.
• February 27 - Samuel Pierpont Langley (born 1834), American astronomer.
• March 8 - Henry Baker Tristram (born 1822), English ornithologist.
• April 19 - Pierre Curie (born 1859), French winner of the Nobel Prize in Physics.
• July 5 - Paul Drude (born 1863), German physicist.
• September 5 - Ludwig Boltzmann (born 1844), Austrian physicist.

References

fr:1906 en science he:1906 mk:1906 no:Vitenskaps ret 1906 nn:Vitskap i 1906 pl:1906 w nauce pt:1906 na ci ncia ru:1906 sk:1906 vo vede sv:Vetenskaps ret 1906