1906 in science

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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.

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. Harry Fielding Reid devizes the elastic-rebound theory to account for earthquake mechanism.
• Richard Oldham argues that the Earth has a molten interior.

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.
• October–December – Martha Baer undergoes sex reassignment surgery to become Karl M. Baer in Germany.
• November 3 – A speech given by Alois Alzheimer for the first time presents the pathology and clinical symptoms of pre-senile dementia together; the condition will rapidly become known as Alzheimer's disease.
• BCG (Bacilli-Calmette-Guerin) immunization for Tuberculosis first developed.
• Transmission of dengue fever by the Aedes mosquito is confirmed.
• Frederick Hopkins suggests the existence of vitamins and suggests that a lack of them causes scurvy and rickets.
• Clemens Peter von Pirquet, with Béla 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

• January – Lee De Forest files a patent for the Audion vacuum tube, which helps usher in the age of electronics.
• February 10 – Launch of battleship HMS Dreadnought.
• March 18 – Romanian inventor Traian Vuia becomes the first person to fly a heavier-than-air monoplane with unassisted takeoff, at Montesson in France.
• October 18 – German inventor Arthur Korn demonstrates the transmission of a photograph electronically over a distance of 1800 km 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 Anschütz-Kaempfe in Germany.

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 Ramón y Cajal
• Hughes Medal – Hertha Ayrton

Births

• January 6 – G. Ledyard Stebbins (died 2000), American botanist and geneticist.
• 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 Gödel (died 1978), mathematician.
• June 13 – Bruno de Finetti (died 1985), statistician.
• June 18 – Orvan Hess (died 2002), obstetrician.
• June 23 – Derek Jackson (died 1982), spectroscopist and steeplechase rider (also his twin brother Vivian).
• July 2 – Hans Bethe (died 2005), Nobel Prize Physicist.
• August 19 – Philo T. Farnsworth (died 1971), television pioneer.
• September 1 – Karl August Folkers (died 1997), biochemist.
• September 4 – Max Delbrück (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.
• November 18 – George Wald (died 1997), scientist.
• 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.
• January 14 – Hermann Sprengel (born 1834), German-born British chemist.
• 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.
• May 15 – James Blyth (born 1839), Scottish electrical engineer.
• July 5 – Paul Drude (born 1863), German physicist (suicide).
• September 5 – Ludwig Boltzmann (born 1844), Austrian physicist.