1904 in science

Astronomy

• Johannes Franz Hartmann discovers the interstellar medium.
• Edward Walter Maunder plots the first sunspot "butterfly diagram".
• Notable asteroid 522 Helga is discovered by Max Wolf in Heidelberg.
• December 3 – The sixth moon of Jupiter, later called Himalia, is discovered at Lick Observatory.

Cartography

• Van der Grinten projection proposed.

Mathematics

• Henri Poincaré discovers the Poincaré homology sphere, leading him to formulate the Poincaré conjecture.
• Helge von Koch describes the "Koch snowflake", one of the earliest fractal curves described.
• Charles Spearman develops his rank correlation coefficient.
• Ernst Zermelo formulates the axiom of choice to formalize his proof of the well-ordering theorem.

Medicine

• September 17 – An early study on the relationship between alcohol and cardiovascular disease is published in the United States.
• Epinephrine first artificially synthesized by Friedrich Stolz.
• Antoni Leśniowski presents to a meeting of the Warsaw Medical Society a surgical specimen of an inflammatory tumour of the terminal ileum with a fistula to the ascending colon, consistent with what will later become known as Crohn's disease.

Physics

• Vacuum tube invented by John Ambrose Fleming.
• James H. Jeans's The Dynamical Theory of Gases is published in Cambridge.
• J. J. Thomson proposes the plum pudding model for the atom.
• Hantaro Nagaoka develops the Saturnian model for the atom.

Technology

• July 4 – Piero Ginori Conti demonstrates the use of geothermal power to generate electricity, at Larderello in Italy.
• July 23 – A continuous track tractor is patented by David Roberts of Richard Hornsby & Sons of Grantham in England.
• November 16 – John Ambrose Fleming patents the first thermionic vacuum tube, the two-electrode diode ("oscillation valve" or Fleming valve).
• November 24 – A continuous track tractor is demonstrated by the Holt Manufacturing Company in the United States.
• The first diesel engined submarine, the Z, is built in France.
• The Heckelphone variety of oboe is invented by Wilhelm Heckel and his sons.
• The sleeve valve is invented by Charles Yale Knight.
• The turbine-powered Bliss-Leavitt torpedo, designed by Frank McDowell Leavitt and manufactured by the E. W. Bliss Company of Brooklyn, is put into service by the United States Navy.
• Lucien Bull produces the first successful chronophotography (of insect flight), working in France.
• Rue Franklin Apartments, Paris, are completed by Auguste Perret and his brother Gustave, an early example of an exposed reinforced concrete frame building.

Zoology

• First identification and last confirmed sighting of the Choiseul pigeon in the Solomon Islands.

Awards

• Nobel Prizes
  • Physics – John William Strutt, 3rd Baron Rayleigh
  • Chemistry – Sir William Ramsay
  • Medicine – Ivan Pavlov

Births

• January 21 – Edris Rice-Wray Carson (died 1990), American-born physician, pioneer in family planning.
• January 26 – Ancel Keys (died 2004), American nutritionist.
• March 13 – René Dumont (died 2001), French agronomist.
• March 20 – B. F. Skinner (died 1990), American behavioral psychologist.
• April 11 – Arthur Mourant (died 1994), Jersiais hematologist.
• April 22 – J. Robert Oppenheimer (died 1967), American physicist.
• June 3 – Charles R. Drew (died 1950), African American physician, pioneer in blood transfusion.
• July 5 – Ernst Mayr (died 2005), German-born evolutionary biologist.
• August 5 – Kenneth V. Thimann (died 1997), English-American plant physiologist and microbiologist known for his studies of plant hormones.
• August 17 – Cornelis Simon Meijer (died 1974), Dutch mathematician.
• August 28 – Secondo Campini (died 1980), Italian jet pioneer.
• August 29 – Werner Forssmann (died 1979), German physician, recipient of the Nobel Prize in Physiology or Medicine.
• November 11 – J. H. C. Whitehead (died 1960), British mathematician.
• Sven Sømme (died 1961), Norwegian ichthyologist and resistance worker.

Deaths

• March 7 – Ferdinand André Fouqué (born 1828), French geologist, petrologist and volcanologist.
• May 10 – Henry Morton Stanley (born 1841), Welsh-born explorer and journalist.
• July 3 – John Bell Hatcher (born 1861), American paleontologist.
• September 24 – Niels Ryberg Finsen (born 1860), Icelandic/Faroese/Danish physician and scientist, recipient of the Nobel Prize in Physiology or Medicine.
• October 7 – Isabella Bird (born 1831), British explorer, writer, photographer and naturalist.
• October 21 – Isabelle Eberhardt (born 1877), Swiss–Algerian explorer.

References

References

1. Asimov, Isaac. "[[Asimov's Biographical Encyclopedia of Science and Technology]]".
2. "Sur une courbe continue sans tangente, obtenue par une construction géométrique élémentaire".
3. Addison, Paul S.. (1997). "Fractals and Chaos: An Illustrated Course". Institute of Physics.
4. Crilly, Tony. (2007). "50 Mathematical Ideas you really need to know". Quercus.
5. Zermelo, Ernst. (1904). "Beweis, dass jede Menge wohlgeordnet werden kann". [[Mathematische Annalen]].
6. Cabot, Richard C.. (1904). "The relation of alcohol to arterioscleroisis". [[Journal of the American Medical Association]].
7. Bartnik, W.. (December 2003). "Inflammatory bowel disease – Polish contribution". Polish Physiological Society.
8. Robinson, Peter. (2003). "Lincoln's Excavators: The Ruston years 1875–1930". Roundoak.
9. (1999). "The Hutchinson Factfinder". Helicon.
10. Newpower, Anthony. (2006). "Iron Men And Tin Fish: The Race to Build a Better Torpedo During World War II". Greenwood Publishing Group.
11. Reported by him in "Motional mechanism of the insect wing", ''[[Comptes rendus de l'Académie des sciences]]'' '''138''':590–592 (29 February); "Application of the electric spark to the chrono-photography of rapid motions", ''Comptes rendus'' '''138''':155–157 (21 March); "Chronophotography of rapid motions", ''Bulletin de la Société Philomathiclue'' (Paris) (June 11); Synthesis in chronophotography, ''Bulletin de la Société Philomathiclue'' (November 12).
12. "Rue Franklin Apartments". GreatBuildings.
13. Rothschild, Walter. (1904-05-20). "''Microgoura'', n. gen.". Bulletin of the British Ornithologists' Club.