Arthur Jeffrey Dempster

Arthur Jeffrey Dempster, Canadian-American physicist and academic (died 1950)

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Born: August 14, 1886
Died: March 11, 1950
Zodiac sign: Leo
Birth year: 1886

About Arthur Jeffrey Dempster

Arthur Jeffrey Dempster was a Canadian-American physicist best known for his work in mass spectrometry and his discovery in 1935 of the uranium isotope 235U. As part of his research, he investigated the isotopic constitution of multiple other elements. Arthur Jeffrey Dempster (August 14, 1886 – March 11, 1950) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery in 1935 of the uranium isotope 235U. In 1918, Dempster developed the first modern mass spectrometer, a scientific apparatus allowing physicists to identify compounds by the mass of elements in a sample, and determine the isotopic composition of elements in a sample.

Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.

Arthur Jeffrey Dempster timeline

1886Arthur Jeffrey Dempster (August 14, 1886 – March 11, 1950) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery in 1935 of the uranium isotope 235U.
1918In 1918, Dempster developed the first modern mass spectrometer, a scientific apparatus allowing physicists to identify compounds by the mass of elements in a sample, and determine the isotopic composition of elements in a sample.

The world when Arthur Jeffrey Dempster was born

Arthur Jeffrey Dempster was born in 1886. The year snapshot below places that birthday in its cultural and historical setting: the music and films people were following, the headlines shaping public life, and the everyday prices families encountered.

Headlines and milestones

Major sports momentFirst professional baseball game under electric lights
Top headlineStatue of Liberty dedicated in New York Harbor
Technology milestoneCoca-Cola invented in Atlanta
Notable inventionCoca-Cola (originally contained cocaine)
World population~1.46B

United States snapshot

U.S. leaderGrover Cleveland
U.S. population55.6M

1886 versus 2026

These figures put everyday life in Arthur Jeffrey Dempster's birth year beside the site's latest United States snapshot.

Measure	1886	2026
Population	55.6M	341 million

Sources and editorial standards

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