Scientist of the Day

Edward Troughton

June 12, 2020

Edward Troughton, an English instrument maker, died on June 12, 1835; he was born on an unknown day in 1753.  Troughton built and sold a variety of astronomical instruments and telescopes; today, we are going to focus on his specialty, the transit instrument.  A...

Ewald Jürgen von Kleist

June 10, 2020

Ewald Jürgen von Kleist, a Pomeranian cleric, judge, and dabbler in electrical science, was born June 10, 1700. For 23 years, von Kleist had been Dean of the Cathedral in Kamien Pomorski, Pomerania, in northwest Poland, when on Oct. 11, 1745, in a most unclerical...

Johan Keulemans

June 8, 2020

Johan Gerard Keulemans, a Dutch illustrator, was born June 8, 1842. Keulemans moved to London in 1868 and almost immediately became one of the most sought-after zoological artists for a new wave of natural history books that was beginning to appear. After the...

John Trumbull and Benjamin Silliman

June 6, 2020

John Trumbull, an American painter, was born June 6, 1756.  John was the son of Jonathan Trumbull, Sr., who was governor of Connecticut during the Revolutionary War, and the younger brother of Jonathan Jr., who would govern Connecticut during the early decades of the...

Eleanor Coade

June 3, 2020

Eleanor Coade, an English manufacturer, was born June 3, 1733.  Coade was a pioneer in manufacturing artificial stone for use in monuments, which she called Coade stone. There had been other artificial stones before Coade stone, but they were not very satisfactory –...

Geminiano Montanari

June 1, 2020

Geminiano Montanari, an Italian physicist and astronomer, was born June 1, 1633. Montanari is best known for discovering that Algol, a bright star in the constellation Perseus, is a variable star, so that its brightness falls off for about ten hours every three days...