Robert Andrews Millikan

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Robert A. Millikan
Robert Andrews Millikan 1920s.jpg
Millikan in the 1920s
1stPresident of the California Institute of Technology
In office
Succeeded by Lee Alvin DuBridge
Personal details
Robert Andrews Millikan

(1868-03-22)March 22, 1868
Morrison, Illinois, U.S.
DiedDecember 19, 1953(1953-12-19) (aged 85)
San Marino, California, U.S.
Alma mater
Known for
Spouse(s)Greta ( née Blanchard)
Scientific career
Fields Physics
Thesis On the polarization of light emitted from the surfaces of incandescent solids and liquids.  (1895)
Doctoral advisor
Other academic advisors Mihajlo Pupin
Albert A. Michelson
Walther Nernst
Doctoral students
Military career
AllegianceFlag of the United States (1912-1959).svg  United States
Service/branch United States Army [3]
Years of service1917–1918
Rank Lieutenant Colonel
Unit Aviation Section, U.S. Signal Corps
Robert Andrews Milliken signature.svg

Robert Andrews Millikan (March 22, 1868 – December 19, 1953) was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for the measurement of the elementary electric charge and for his work on the photoelectric effect.


Millikan graduated from Oberlin College in 1891 and obtained his doctorate at Columbia University in 1895. In 1896 he became an assistant at the University of Chicago, where he became a full professor in 1910. In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron. He began by measuring the course of charged water droplets in an electric field. The results suggested that the charge on the droplets is a multiple of the elementary electric charge, but the experiment was not accurate enough to be convincing. He obtained more precise results in 1910 with his famous oil-drop experiment in which he replaced water (which tended to evaporate too quickly) with oil.

In 1914 Millikan took up with similar skill the experimental verification of the equation introduced by Albert Einstein in 1905 to describe the photoelectric effect. He used this same research to obtain an accurate value of Planck’s constant. In 1921 Millikan left the University of Chicago to become director of the Norman Bridge Laboratory of Physics at the California Institute of Technology (Caltech) in Pasadena, California. There he undertook a major study of the radiation that the physicist Victor Hess had detected coming from outer space. Millikan proved that this radiation is indeed of extraterrestrial origin, and he named it "cosmic rays." As chairman of the Executive Council of Caltech (the school's governing body at the time) from 1921 until his retirement in 1945, Millikan helped to turn the school into one of the leading research institutions in the United States. [4] [5] He also served on the board of trustees for Science Service, now known as Society for Science & the Public, from 1921 to 1953.



Millikan in 1891 Robert-millikan2.jpg
Millikan in 1891

Robert Andrews Millikan was born on March 22, 1868, in Morrison, Illinois. [6] He went to high school in Maquoketa, Iowa and received a bachelor's degree in the classics from Oberlin College in 1891 and his doctorate in physics from Columbia University in 1895 [7] – he was the first to earn a Ph.D. from that department. [8]

At the close of my sophomore year [...] my Greek professor [...] asked me to teach the course in elementary physics in the preparatory department during the next year. To my reply that I did not know any physics at all, his answer was, "Anyone who can do well in my Greek can teach physics." "All right," said I, "you will have to take the consequences, but I will try and see what I can do with it." I at once purchased an Avery's Elements of Physics, and spent the greater part of my summer vacation of 1889 at home – trying to master the subject. [...] I doubt if I have ever taught better in my life than in my first course in physics in 1889. I was so intensely interested in keeping my knowledge ahead of that of the class that they may have caught some of my own interest and enthusiasm. [9]

Millikan's enthusiasm for education continued throughout his career, and he was the coauthor of a popular and influential series of introductory textbooks, [10] which were ahead of their time in many ways. Compared to other books of the time, they treated the subject more in the way in which it was thought about by physicists. They also included many homework problems that asked conceptual questions, rather than simply requiring the student to plug numbers into a formula.

Charge of the electron

Millikan's original oil-drop apparatus, circa 1909-1910 Millikan's oil-drop apparatus 1.jpg
Millikan's original oil-drop apparatus, circa 1909–1910
Millikan receives a check for over $40,000 for winning the Nobel Prize Robert A. Millikan 1924.png
Millikan receives a check for over $40,000 for winning the Nobel Prize

Starting in 1908, while a professor at the University of Chicago, Millikan worked on an oil-drop experiment in which he measured the charge on a single electron. J. J. Thomson had already discovered the charge-to-mass ratio of the electron. However, the actual charge and mass values were unknown. Therefore, if one of these two values were to be discovered, the other could easily be calculated. Millikan and his then graduate student Harvey Fletcher used the oil-drop experiment to measure the charge of the electron (as well as the electron mass, and Avogadro's number, since their relation to the electron charge was known).

Professor Millikan took sole credit, in return for Harvey Fletcher claiming full authorship on a related result for his dissertation. [11] Millikan went on to win the 1923 Nobel Prize for Physics, in part for this work, and Fletcher kept the agreement a secret until his death. [12] After a publication on his first results in 1910, [13] contradictory observations by Felix Ehrenhaft started a controversy between the two physicists. [14] After improving his setup, Millikan published his seminal study in 1913. [15]

The elementary charge is one of the fundamental physical constants, and accurate knowledge of its value is of great importance. His experiment measured the force on tiny charged droplets of oil suspended against gravity between two metal electrodes. Knowing the electric field, the charge on the droplet could be determined. Repeating the experiment for many droplets, Millikan showed that the results could be explained as integer multiples of a common value (1.592 × 10−19 coulomb), which is the charge of a single electron. That this is somewhat lower than the modern value of 1.602 176 53(14) x 10−19 coulomb is probably due to Millikan's use of an inaccurate value for the viscosity of air. [16] [17]

Although at the time of Millikan's oil-drop experiments it was becoming clear that there exist such things as subatomic particles, not everyone was convinced. Experimenting with cathode rays in 1897, J. J. Thomson had discovered negatively charged 'corpuscles', as he called them, with a charge-to-mass ratio 1840 times that of a hydrogen ion. Similar results had been found by George FitzGerald and Walter Kaufmann. Most of what was then known about electricity and magnetism, however, could be explained on the basis that charge is a continuous variable; in much the same way that many of the properties of light can be explained by treating it as a continuous wave rather than as a stream of photons.

The beauty of the oil-drop experiment is that as well as allowing quite accurate determination of the fundamental unit of charge, Millikan's apparatus also provided a 'hands on' demonstration that charge is actually quantized. The General Electric Company's Charles Steinmetz, who had previously thought that charge is a continuous variable, became convinced otherwise after working with Millikan's apparatus.

Data selection controversy

There is some controversy over selectivity in Millikan's use of results from his second experiment measuring the electron charge. This issue has been discussed by Allan Franklin, [18] a former high-energy experimentalist and current philosopher of science at the University of Colorado. Franklin contends that Millikan's exclusions of data do not affect the final value of the charge obtained, but that Millikan's substantial "cosmetic surgery" reduced the statistical error. This enabled Millikan to give the charge of the electron to better than one half of one percent; in fact, if Millikan had included all of the data he discarded, the error would have been less than 2%. While this would still have resulted in Millikan's having measured the charge of e better than anyone else at the time, the slightly larger uncertainty might have allowed more disagreement with his results within the physics community, which Millikan likely tried to avoid. David Goodstein argues that Millikan's statement, that all drops observed over a sixty-day period were used in the paper, was clarified in a subsequent sentence which specified all "drops upon which complete series of observations were made". Goodstein attests that this is indeed the case and notes that five pages of tables separate the two sentences. [19]

Photoelectric effect

Robert Millikan and Albert Einstein at the California Institute of Technology in 1932 Millikan and Einstein 1932.png
Robert Millikan and Albert Einstein at the California Institute of Technology in 1932

When Einstein published his seminal 1905 paper on the particle theory of light, Millikan was convinced that it had to be wrong, because of the vast body of evidence that had already shown that light was a wave. He undertook a decade-long experimental program to test Einstein's theory, which required building what he described as "a machine shop in vacuo" in order to prepare the very clean metal surface of the photo electrode. His results published in 1914 confirmed Einstein's predictions in every detail, [20] but Millikan was not convinced of Einstein's interpretation, and as late as 1916 he wrote, "Einstein's photoelectric equation... cannot in my judgment be looked upon at present as resting upon any sort of a satisfactory theoretical foundation," even though "it actually represents very accurately the behavior" of the photoelectric effect. In his 1950 autobiography, however, he simply declared that his work "scarcely permits of any other interpretation than that which Einstein had originally suggested, namely that of the semi-corpuscular or photon theory of light itself". [21]

Since Millikan's work formed some of the basis for modern particle physics, it is ironic that he was rather conservative in his opinions about 20th century developments in physics, as in the case of the photon theory. Another example is that his textbook, as late as the 1927 version, unambiguously states the existence of the ether, and mentions Einstein's theory of relativity only in a noncommittal note at the end of the caption under Einstein's portrait, stating as the last in a list of accomplishments that he was "author of the special theory of relativity in 1905 and of the general theory of relativity in 1914, both of which have had great success in explaining otherwise unexplained phenomena and in predicting new ones."

Millikan is also credited with measuring the value of Planck's constant by using photoelectric emission graphs of various metals. [22]

Later life

Robert A. Millikan around 1923 Millikan.jpg
Robert A. Millikan around 1923

In 1917, solar astronomer George Ellery Hale convinced Millikan to begin spending several months each year at the Throop College of Technology, a small academic institution in Pasadena, California, that Hale wished to transform into a major center for scientific research and education. A few years later Throop College became the California Institute of Technology (Caltech), and Millikan left the University of Chicago in order to become Caltech's "chairman of the executive council" (effectively its president). Millikan would serve in that position from 1921 to 1945. At Caltech most of his scientific research focused on the study of "cosmic rays" (a term which he coined). In the 1930s he entered into a debate with Arthur Compton over whether cosmic rays were composed of high-energy photons (Millikan's view) or charged particles (Compton's view). Millikan thought his cosmic ray photons were the "birth cries" of new atoms continually being created to counteract entropy and prevent the heat death of the universe. Compton would eventually be proven right by the observation that cosmic rays are deflected by the Earth's magnetic field (and so must be charged particles).

Robert Millikan was Vice Chairman of the National Research Council during World War I. During that time, he helped to develop anti-submarine and meteorological devices. He received the Chinese Order of Jade [ when? ]. After the War, Millikan contributed to the works of the League of Nations' Committee on Intellectual Cooperation (from 1922, in replacement to George E. Hale, to 1931), with other prominent researchers (Marie Curie, Albert Einstein, Hendrik Lorentz, etc.). [23] In his private life, Millikan was an enthusiastic tennis player. He was married and had three sons, the eldest of whom, Clark B. Millikan, became a prominent aerodynamic engineer. Another son, Glenn, also a physicist, married the daughter (Clare) of George Leigh Mallory of "Because it's there" Mount Everest fame. Glenn was killed in a climbing accident in Cumberland Mountains in 1947. [24]

A religious man and the son of a minister, in his later life Millikan argued strongly for a complementary relationship between Christian faith and science. [25] [26] [27] [28] He dealt with this in his Terry Lectures at Yale in 1926–27, published as Evolution in Science and Religion. [29] He was a Christian theist and proponent of theistic evolution. [30] A more controversial belief of his was eugenics. He was one of the initial trustees of the Human Betterment Foundation and praised San Marino, California for being "the westernmost outpost of Nordic civilization ... [with] a population which is twice as Anglo-Saxon as that existing in New York, Chicago, or any of the great cities of this country." [31]

1931 sketch of California Institute of Technology President Robert A. Millikan Robert A. Millikan sketch 1931.png
1931 sketch of California Institute of Technology President Robert A. Millikan

On account of Millikan's affiliation with the Human Betterment Foundation, in January 2021, the Caltech Board of Trustees authorized removal of Millikan's name (and the names of five other historical figures affiliated with the Foundation), from campus buildings. [32]

Westinghouse time capsule

In 1938, he wrote a short passage to be placed in the Westinghouse Time Capsules. [33]

At this moment, August 22, 1938, the principles of representative ballot government, such as are represented by the governments of the Anglo-Saxon, French, and Scandinavian countries, are in deadly conflict with the principles of despotism, which up to two centuries ago had controlled the destiny of man throughout practically the whole of recorded history. If the rational, scientific, progressive principles win out in this struggle there is a possibility of a warless, golden age ahead for mankind. If the reactionary principles of despotism triumph now and in the future, the future history of mankind will repeat the sad story of war and oppression as in the past.

Death and legacy

Robert A. Millikan circa 1953 Robert A. Millikan 1954.png
Robert A. Millikan circa 1953
The former Millikan Library at Caltech in 2010 (renamed Caltech Hall in 2021) MillikanBuilding2010.jpg
The former Millikan Library at Caltech in 2010 (renamed Caltech Hall in 2021)

Millikan died of a heart attack at his home in San Marino, California in 1953 at age 85, and was interred in the "Court of Honor" at Forest Lawn Memorial Park Cemetery in Glendale, California.

On January 26, 1982, he was honored by the United States Postal Service with a 37¢ Great Americans series (1980–2000) postage stamp. [34]

Tektronix named a street on their Portland, Oregon, campus after Millikan with the Millikan Way (MAX station) of Portland's MAX Blue Line named after the street.[ clarification needed ]

Name removal from college campuses during the 21st century

During the mid to late 20th century, several colleges had named buildings, physical features, awards, and professorships in honor of Robert Millikan.

In 1958, Pomona College named a science building Millikan Laboratory in honor of Millikan. After reviewing Millikan's association with the eugenics movement, the college administration voted in October 2020 to rename the building as the Ms. Mary Estella Seaver and Mr. Carlton Seaver Laboratory. [35]

On the Caltech campus, several physical features, rooms, awards, and a professorship were named in honor of Millikan, most notable, the Millikan Library which was completed in 1966. In January 2021, the Board of Trustees voted to immediately strip Millikan's name from the Caltech campus because of his association with eugenics. The Robert A. Millikan Library has been renamed Caltech Hall. [36]

Possible name removal from secondary schools during the 21st century

In November 2020, Millikan Middle School (formerly Millikan Junior High School) in the suburban Los Angeles neighborhood of Sherman Oaks started the process of renaming their school. [37]

In August 2020, the Long Beach Unified School District established a committee that would examine the need for renaming of their Robert A. Millikan High School. [38] [39]

Name removal from awards

In Spring of 2021, the American Association of Physics Teachers voted unanimously to remove Millikan's name from the Robert A. Millikan award, which honors "notable and intellectually creative contributions to the teaching of physics."

Personal life

Greta Millikan in 1923 Greta Ervin Millikan 1923.png
Greta Millikan in 1923

In 1902 he married Greta Ervin Blanchard (1876-1955). They had three sons: Clark Blanchard, Glenn Allan, and Max Franklin. [5]

Famous statements

"If Kevin Harding's equation and Aston's curve are even roughly correct, as I'm sure they are, for Dr. Cameron and I have computed with their aid the maximum energy evolved in radioactive change and found it to check well with observation, then this supposition of an energy evolution through the disintegration of the common elements is from the one point of view a childish Utopian dream, and from the other a foolish bugaboo." [40]

"No more earnest seekers after truth, no intellectuals of more penetrating vision can be found anywhere at any time than these, and yet every one of them has been a devout and professed follower of religion." [41]


See also

Robert Millikan is widely believed to have been denied the 1920 prize for physics owing to Felix Ehrenhaft's claims to have measured charges smaller than Millikan's elementary charge. Ehrenhaft's claims were ultimately dismissed and Millikan was awarded the prize in 1923.

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  1. "Comstock Prize in Physics". National Academy of Sciences. Archived from the original on December 29, 2010. Retrieved February 13, 2011.
  2. "Millikan, son, aide get medals of merit". New York Times. March 22, 1949. Retrieved August 30, 2018.
  3. Bates, Charles C. & Fuller, John F. (July 1, 1986). "Chapter 2: The Rebirth of Military Meteorology". America's Weather Warriors, 1814–1985. Texas A&M University Press. pp.  17–20. ISBN   978-0890962404.
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  10. The books, coauthored with Henry Gordon Gale, were A First Course in Physics (1906), Practical Physics (1920), Elements of Physics (1927), and New Elementary Physics (1936).
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  14. Ehrenhaft, F (1910). "Über die Kleinsten Messbaren Elektrizitätsmengen". Phys. Z. 10: 308.
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  17. Feynman, Richard Phillips; Leighton, Ralph; Hutchings, Edward (April 1, 1997). "Surely you're joking, Mr. Feynman!": adventures of a curious character. New York: W. W. Norton & Company. p. 342. ISBN   978-0-393-31604-9 . Retrieved July 10, 2010.
  18. Franklin, A. (1997). "Millikan's Oil-Drop Experiments". The Chemical Educator . 2 (1): 1–14. doi:10.1007/s00897970102a. S2CID   97609199.
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  20. Millikan, R. (1914). "A Direct Determination of "h."". Physical Review. 4 (1): 73–75. Bibcode:1914PhRv....4R..73M. doi:10.1103/PhysRev.4.73.2.
  21. Anton Z. Capri, "Quips, quotes, and quanta: an anecdotal history of physics" (World Scientific 2007) p.96
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  24. Severinghaus, John W.; Astrup, Poul B. (1986). "History of blood gas analysis. VI. Oximetry". Journal of Clinical Monitoring and Computing. 2 (4): 270–288 (278). doi:10.1007/BF02851177. PMID   3537215. S2CID   1752415.
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  34. "37c Robert Millikan single". National Postal Museum .
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  36. Hiltzik, Michael (January 15, 2021). "Confronting a racist past, Caltech will excise names of eugenics backers from campus". Los Angeles Times .
  37. "Timeline for School Renaming Process". Millikan Middle School. Archived from the original on November 27, 2020.
  38. Guardabascio, Mike (August 6, 2020). "After renewed cry for change, LBUSD reconvenes committee to examine school names". Long Beach Post.
  39. Rosenfeld, David (July 12, 2020). "Push On To Rename Schools, Including In Long Beach". Grunion.
  40. Millikan, Robert Andrews, Science and the New Civilization [1st Ed.], Charles Scribner's and Sons, 1930, p. 95
  41. Millikan, Robert A., “A Scientist Confesses His Faith”-Christian Century


Academic offices
Preceded by
James Scherer
as President of the Throop College of Technology
President of the California Institute of Technology
1921 – 1946
Succeeded by
Lee DuBridge