Monthly Archives: March 2015

The Expeditions of John Wesley Powell

The Expeditions of John Wesley Powell

On March 24, 1834, American geologist and ethnologist John Wesley Powell was born. He published the first classification of American Indian languages and was the first director of the U.S. Bureau of Ethnology. He is famous for the 1869 Powell Geographic Expedition, a three-month river trip down the Green and Colorado rivers, including the first known passage through the Grand Canyon. “Economy in speech is the force by which its development has…
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Daniel Quare and the Repeating Watch Movement

Daniel Quare and the Repeating Watch Movement

On March 21, 1724, English clockmaker and instrument maker Daniel Quare passed away. He is best known for his invention of a repeating watch movement in 1680 and a portable barometer in 1695. Daniel Quare – A Brother of the Clockmaker’s Company Daniel Quare was probably born in 1648, but the sources differ. He was admitted a brother of the Clockmakers’ Company in April 1671. When Quare started his career, the pendulum…
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Jeremias Richter and the Law of Definite Proportions

Jeremias Richter and the Law of Definite Proportions

On March 10, 1762, German chemist Jeremias Benjamin Richter was born. He discovered the law of definite proportions and is best known for introducing the term stoichiometry, i.e. the calculation of relative quantities of reactants and products in chemical reactions. Youth and Education Jeremias Benjamin Richter was born at Hirschberg in Silesia, today’s Jelenia Góra in Western Poland. He graduated from the Hirschberg Gymnasium, and in 1778 joined the engineering corps of…
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Henry Draper and his Passion for Astronomy

Henry Draper and his Passion for Astronomy

On March 7, 1837, American physiologist and amateur astronomer Henry Draper was born. He is best known today as a pioneer of astrophotography. After his death, the Henry Draper Catalog of stellar spectra as well the Henry Draper medal is named after him. Henry Draper – Early Years Henry Draper was the son of John William Draper,[6] a doctor, chemist, and professor at New York University. He was known for his interest in…
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