Debendra Mohan Bose

Debendra Mohan Bose (26 November 1885 – 2 June 1975) was an Indian physicist who made contributions in the field of cosmic rays, artificial radioactivity and neutron physics.[1] He was the longest serving Director (1938–1967) of Bose Institute.[2] Bose was the nephew of the famous physicist Jagadish Chandra Bose, who laid the foundations of modern science in the Indian subcontinent.

Debendra Mohan Bose
M N Saha, J C Bose, J C Ghosh,Snehamoy Dutt, S N Bose, D M Bose, N R Sen, J N Mukherjee, N C Nag.jpg
Debendra Mohan Bose (Standing, third from left) with other scientists of Calcutta University
Born(1885-11-26)26 November 1885
Died2 June 1975(1975-06-02) (aged 89)
Calcutta, West Bengal, India
Alma materUniversity of Calcutta
University of Berlin
Spouse(s)Nalini Sircar (1919-1975)
Scientific career
FieldsParticle physics
Nuclear physics
InstitutionsUniversity of Calcutta
Cavendish Laboratory
University of Berlin
Bose Institute
Doctoral advisorErich Regener
Other academic advisorsJagadish Chandra Bose
JJ Thomson

Early lifeEdit

Debendra Mohan Bose was born in Calcutta in a famous Brahmo family. He was the youngest son of Mohini Mohan Bose, one of the first Indians to proceed to U.S.A to qualify himself in homeopathy. Ananda Mohan Bose was his paternal uncle, while Jagadish Chandra Bose was his maternal uncle.[3] After his father's untimely death, Debendra's education was supervised by his uncle J C Bose.

Debendra's plan of getting a degree in engineering from the Bengal Engineering College, Shibpur was cut short when he suffered a severe malaria attack. Nobel laureate Rabindranath Tagore, a close friend of J C Bose, suggested him to pursue physics instead. In 1906, Debendra Bose obtained his MA degree from the University of Calcutta in first class. He worked as a research scholar under J C Bose for one year, during which he participated in his uncle's biophysical and plant physiological investigations.[3]

As an academicEdit

In July 1919, DM Bose re-joined the Calcutta University as Rashbehary Ghosh Professor of Physics. In 1932, he succeeded Professor C. V. Raman as the Palit Professor of Physics. He was one of the only two Indian physicists (the other being M. N. Saha) who participated at the Como conference (11–20 September 1927) held at Lake Como in Italy. The conference featured 60 invited participants from 14 countries, including 11 Nobel laureates.[2]

DM Bose encouraged several of his junior colleagues at the Calcutta University to pursue research. He gave Satyendra Nath Bose two books of Max Planck, Thermodynamik and Warmestrahlung (unavailable in India then). This led to SN Bose's interest in Planck's hypothesis and his deduction on a combinatorial basis of Planck's formula in 1925.[2]

In 1938, DM Bose became the Director of Bose Institute after the death of the Institute's founder JC Bose. In 1945, Bose was inducted as a nuclear chemistry expert in the Atomic Energy Committee of CSIR. The committee later became the Atomic Energy Commission (AEC).[2]

Research with Biva ChoudhuriEdit

A discussion during the 1938 Science Congress Session prompted D. M. Bose and his colleague Bibha Chowdhuri[4] to study cosmic rays using photographic plates. Since the particle accelerators were not available at this time, high-energy subatomic particles were only obtainable from atmospheric cosmic rays. Walther Bothe gave the duo the idea of considering photographic emulsion as a continuously active cloud chamber to register and store tracks.

Due to the World War II restrictions, full tone photographic plates were not available in India at that time. During 1939–1942, Bose and Choudhuri exposed Ilford half-tone photographic plates in the high altitude mountainous regions of Darjeeling, and observed long curved ionizing tracks that appeared to be different from the tracks of alpha particles or protons. In a series of articles published in Nature, they identified a cosmic particle having an average mass close to 200 times the mass of electron.[2] Their research came to an end when Choudhuri left India in 1945 to work with Patrick Blackett in England.

In Europe, Cecil Frank Powell independently used exactly the same method to identify the new particle pi-meson (now pion), but with improved full-tone photographic emulsion plates. He was awarded the Nobel Prize in Physics in 1950 "for his development of the photographic method of studying nuclear processes and his discoveries regarding mesons made with this method".[5] Powell acknowledge the method developed by Bose and Choudhuri as the first attempt in this field in his 1959 book The Study of Elementary Particles by the Photographic Method.[6]

Later lifeEdit

As director of the Bose Institute, D M Bose expanded the activities of the existing departments and also opened the new department of microbiology. He was a dedicated worker of the Sadharan Brahmo Samaj and was served several years as its office bearer (President, Secretary & Treasurer). He was the General President of the Indian Science Congress Session in 1953 at Lucknow. Bose served as the director of the Bose Institute till 1967, when his arthritis and other health problems forced him to take retirement. In the later years of his life, he became more interested in philosophy focusing on the relationship between religion and science.[3] He died on the morning of 2 June 1975.

Como Conference - S.N. Bose vs. D.M. BoseEdit

In 1927, at the occasion of the 100th death anniversary of A. Volta, in Como, a conference was organized (as mentioned above). D.M. Bose and M.N. Saha participated. In the late 1980s it was reported that the "wrong" Bose, that is, D.M. Bose attended the meeting. The invitation was supposed to be for S.N. Bose. The historical documents suggest that D.M. Bose was not the "wrong" person, because in those days his national and international status was far better than that of S.N. Bose.[7][8]


  1. ^ Indian National Science Academy (1983). Biographical memoirs of fellows of the Indian National Science Academy, Volume 7.
  2. ^ a b c d e "D. M. Bose: A Scientist Incognito (editorial)" (PDF). Science and Culture. 76 (11–12). November–December 2010. Retrieved 5 February 2011.
  3. ^ a b c Indian Science Congress Association (2003). The Shaping of Indian Science: 1948-1981. Universities Press. pp. 702–703. ISBN 978-81-7371-433-7.
  4. ^ For more detail see, Rajinder Singh, S.C. Roy (
  5. ^ "The Nobel Prize in Physics 1950". (Nobel Media). Retrieved 6 February 2011.
  6. ^ Cecil Frank Powell (1959). The Study of Elementary Particles by the Photographic Method. Pergamon Press. OCLC 2404250.
  7. ^ Rajinder Singh, Celebrating 125th birth anniversary of DM Bose - Invitation to the Como conference, Science and Culture 76, 494-501, 2010.
  8. ^ Rajinder Singh: D.M. Bose - His scientific work in international context, Shaker Publisher, Aachen 2016. DM Bose Scientific work

External linksEdit