Gabriel Lippmann

Jonas Ferdinand Gabriel Lippmann (16 August 1845 – 13 July 1921) was a Franco-Luxembourgish physicist and inventor. He won the Nobel Prize in Physics for his work on color photography.

Early life and education
Gabriel Lippmann was born in Bonnevoie, Luxembourg (Luxembourgish: Bouneweg), on 16 August 1845. At that time, Bonnevoie was part of the commune of Hollerich.  Bonnevoie is now a district of Luxembourg City.) His father, Isaïe was a French Jew. He managed the family glove-making business. In 1848, the family moved to Paris. At first, Lippmann was tutored by his mother, Miriam Rose (Lévy). He later studied at the Lycée Napoléon (now Lycée Henri-IV). In school, Lippmann did not do well at paying attention. He did have a special interest in mathematics. In 1868, he was admitted to the École normale supérieure in Paris, In 1872, the French government sent him to Heidelberg University. He was able to specialize in electricity  Lippmann receiving a doctorate with "summa cum laude" distinction in 1874.Jacques Bintz, "Gabriel Lippmann 1845–1921", in Gabriel Lippmann: Commémoration par la section des sciences naturelles, physiques et mathématiques de l’Institut grand-ducal de Luxembourg du 150e anniversaire du savant né au Luxembourg, lauréat du prix Nobel en 1908 (Luxembourg: Section des sciences naturelles, physiques et mathématiques de l’Institut grand-ducal de Luxembourg en collaboration avec le Séminaire de mathématique et le Séminaire d’histoire des sciences et de la médecine du centre universitaire de Luxembourg, 1997), Jean-Paul Pier & Jos. A. Massard: éditeurs, Luxembourg 1997. Retrieved 4 December 2010. Lippmann then returned to Paris in 1875. he continued to study until 1878. He then became professor of physics at the Sorbonne.Josef Maria Eder, History of Photography, 4th ed. (New York: Dover, 1978; ), p. 668. (This Dover edition reproduces the Columbia University Press edition of 1945; the book was originally published in 1932 as Geschichte der Photographie.)From Nobel Lectures, Physics 1901–1921, Elsevier Publishing Company, Amsterdam, 1967

Career
Lippmann made important contributions to different areas of physics.

The capillary electrometer
One of Lippmann's early discoveries was the relationship between electrical and capillary phenomena. This let him create a sensitive capillary electrometer. It became known as the Lippmann electrometer. This device was used in the first ECG machine. 

Piezoelectricity
In 1881, Lippmann predicted the converse piezoelectric effect.

Color photography
Lippmann is remembered as the inventor of a way to reproducing colors by photography. It is based on the interference phenomenon. This work earned him the Nobel Prize in Physics for 1908.

In 1886, Lippmann's interest turned to a method of creating the colors of the solar spectrum on a photographic plate. On 2 February 1891, he told the Academy of Sciences: "I have succeeded in obtaining the image of the spectrum with its colors on a photographic plate whereby the image remains fixed and can remain in daylight without deterioration." By April 1892, he said that he had succeeded in creating color images of a stained glass window, a group of flags, a bowl of oranges topped by a red poppy and a colorful parrot. 


The interference phenomenon in optics is a result of the wave propagation of light. When light of a given wavelength is reflected at itself by a mirror, standing waves are created. This is similar to the ripples that are caused when a stone is dropped into water. A standing waves is created when the waves are reflected back at themselves by a surface such as the wall of a pool. In the case of normal incoherent light, the standing waves can only be seen in an extremely small area of space next to the reflecting surface.

Lippmann projected an image onto a special photographic plate. The plate was able to record details smaller than the wavelengths of visible light. The light passed through a glass sheet into a very thin and almost transparent photographic emulsion. The emulsion containing extremely small silver halide grains. A temporary mirror of liquid mercury reflected the light back through the emulsion/ This created standing waves. The nodes almost no effect but their antinodes created an  image. After development, the result was distinct parallel layers made up of submicroscopic metallic silver grains. These layers were a permanent record of the standing waves. In each part of the image, the spacing of the layers corresponded to the half-wavelengths of the light photographed.

Light was shone on the finished plate at a nearly perpendicular angle. Daylight or another source of white light was used. At each point on the plate, light of the same wavelength as the light which had created the layers was reflected back toward the viewer. Light of other wavelengths passed through the emulsion. The wavelengths (colors) of the light which had formed the original image created a full-color image.Bolas, T. et al: A Handbook of Photography in Colours [sic], Marion & Co. (London, 1900):45–59 (Retrieved from archive.org on 11 February 2010)Wall, E. J.: Practical Color Photography, American Photographic Publishing Co. (Boston, 1922):185–199 (Retrieved from archive.org on 5 September 2010)Klaus Biedermann, "Lippmann's and Gabor's Revolutionary Approach to Imaging", Nobelprize.org. Retrieved 6 December 2010.

In practice, the Lippmann process was not easy to use. Higher resolution needed smaller grains. Smaller grains were less affected by light so they needed to be exposed to the light for a longer amount of time.  With a lens with a large opening and a very brightly sunlit subject, a camera exposure of less than one minute were rare. Exposures measured in minutes were normal. Pure colors photographed well, but the colors of real-world objects could be a problem to photograph. The process could not make color prints on paper. It was not possible to make a good copy of a Lippmann color photograph by rephotographing it.  The requirements needed to see the colors to best effect meant the photographs could not be used for casual use. 

The coelostat

Lippmann also invented the coelostat. It is a tool used in astronem that compensated for the rotation of the Earth. This lets people photograph areas of the sky without apparent movement.

Personal life
Lippmann married the daughter of the writer Victor Cherbuliez in 1888. He died on 13 July 1921 aboard the steamer France after leaving Canada."Gabriel Lippmann, Scientist, Dies at Sea", The New York Times, 14 July 1921.

References

Further reading
 J.P. Pier & J.A. Massard (eds) (1997):Gabriel Lippmann: Commémoration par la section des sciences naturelles, physiques et mathématiques de l’Institut grand-ducal de Luxembourg du 150e anniversaire du savant né au Luxembourg, lauréat du prix Nobel en 1908. Luxembourg, Section des sciences naturelles, physiques et mathématiques de l’Institut grand-ducal de Luxembourg en collaboration avec le Séminaire de mathématique et le Séminaire d’histoire des sciences et de la médecine du centre universitaire de Luxembourg, 139 p.
 Lebon, Ernest, "Savants du jour : biographie, bibliographie analytique des écrits", comprenant Portrait de Gabriel Lippmann. – 1911. p. 70, Gauthier-Villars (Paris), 1909–1913.
 Isabelle Bergoend, Le Dagobert optique, Editions Thierry Marchaisse, 2015.

Other websites

 Gabriel Lippmann in Jewish Encyclopedia
 Centre de Recherche Public – Gabriel Lippmann

Category:1845 births
Category:1921 deaths
Category:Nobel Prize in Physics winners
Category:French Nobel Prize winners
Category:Foreign Members of the Royal Society
Category:French physicists
Category:People from Luxembourg City
Category:Luxembourgian scientists