Lawrence Bragg

Lawrence Bragg
Nobel foundation · Public domain · source
Name	Lawrence Bragg
Caption	Sir Lawrence Bragg in 1915
Birth date	31 March 1890
Birth place	Adelaide, South Australia
Death date	1 July 1971
Death place	Ipswich, Suffolk, England
Fields	Physics, Crystallography
Workplaces	University of Manchester, University of Cambridge, Royal Institution
Alma mater	University of Adelaide, University of Cambridge
Doctoral advisor	J. J. Thomson
Known for	Bragg's law, X-ray crystallography
Prizes	Nobel Prize in Physics (1915), Military Cross, Royal Medal, Copley Medal
Spouse	Alice Hopkinson

Lawrence Bragg. Sir William Lawrence Bragg was a pioneering physicist and crystallographer who, with his father William Henry Bragg, founded the science of X-ray crystallography. He formulated Bragg's law, a fundamental principle for determining crystal structures from X-ray diffraction patterns. In 1915, he became the youngest-ever recipient of the Nobel Prize in Physics, which he shared with his father for their work in X-ray analysis. His leadership at institutions like the Cavendish Laboratory and the Royal Institution profoundly influenced the development of molecular biology.

Early life and education

Born in Adelaide, his father William Henry Bragg was a professor at the University of Adelaide. He showed an early aptitude for science, conducting experiments in his father's laboratory. He entered the University of Adelaide at age 15, studying mathematics and chemistry. After the family moved to England in 1909, he enrolled at Trinity College, Cambridge, initially studying mathematics before switching to physics under the guidance of J. J. Thomson. His undergraduate research on the behavior of ions in gases laid the groundwork for his later revolutionary work.

Career and research

Following his Nobel Prize award, he served as a professor of physics at the University of Manchester, succeeding Ernest Rutherford. There, he established a world-leading school of crystallography, mentoring future Nobel laureates like John Desmond Bernal. In 1937, he returned to Cambridge as the director of the National Physical Laboratory before becoming the Cavendish Professor of Physics at the Cavendish Laboratory in 1938. His tenure at the Cavendish was marked by his support for the application of X-ray diffraction to biological molecules, crucially backing the work of Max Perutz and John Kendrew on myoglobin and hemoglobin, and later the team of Francis Crick and James Watson.

World War I and sound ranging

At the outbreak of World War I, he enlisted in the British Army and was commissioned in the Royal Horse Artillery. He was posted to the front in France, where he applied his scientific expertise to the problem of locating enemy artillery. He developed and led a section dedicated to sound ranging, a technique that used an array of microphones to triangulate the position of enemy guns from the sound of their firing. For this vital work, which saved countless lives, he was awarded the Military Cross and appointed an Officer of the Order of the British Empire. His unit's methods were later adopted by allied forces including the United States Army.

Later life and legacy

After leaving the Cavendish Laboratory in 1953, he became the director of the Royal Institution in London, where he revitalized its public lecture program, notably the Royal Institution Christmas Lectures. He worked tirelessly to promote public understanding of science and continued to research the structure of silicates. His greatest legacy is the field of molecular biology, which was born from the X-ray crystallographic techniques he pioneered; the determination of the structure of DNA was the most famous achievement enabled by his foundational work. He died in 1971 in Ipswich and was buried in Trinity College, Cambridge.

Honours and awards

His 1915 Nobel Prize in Physics, shared with his father, remains the pinnacle of his recognition. For his wartime service, he received the Military Cross and was appointed an Officer of the Order of the British Empire. He was knighted in 1941. Scientific honours included the Barnard Medal (1915), the Royal Medal (1946), and the Copley Medal (1966). He served as President of the Physical Society and was a long-time President of the International Union of Crystallography. He was elected a Fellow of the Royal Society in 1921 and served as its Vice-President. Numerous lectureships, medals, and buildings at institutions like the University of Adelaide and the Australian National University bear his name.

Category:English physicists Category:Nobel laureates in Physics Category:Australian scientists