Linda Hall Library
Science Engineering Technology

Louis Essen

Louis Essen, an English physicist, was born Sep. 6, 1908. Essen made two major contributions to physics, in two different fields, which is not as common as you might think, at least not in the twentieth century. In 1946, he developed a method of measuring the speed of...

Lewis Rutherfurd and Cleveland Abbe

On Oct. 13, 1884, the delegates to the International Meridian Conference in Washington D.C. voted to establish a Prime Meridian for navigation and time-keeping purposes. The delegates had been invited by President Chester A. Arthur (second image) to convene on Oct. 1...

Math, Myth, and the Measure of Maya Time

William Saturno, Assistant Professor of Archaeology at Boston University. Much has been made this year of the approaching “end-date” of the Maya calendar and its implications for our own society’s future. Keeping track of the passage of time was very important to the...