
Count Rumford
Born Benjamin Thompson in Woburn, Mass., he was both a brilliant investigator and an unscrupulous careerist. He demonstrated that heat is not a substance called "caloric" but is a mode of motion

Count Rumford
Born Benjamin Thompson in Woburn, Mass., he was both a brilliant investigator and an unscrupulous careerist. He demonstrated that heat is not a substance called "caloric" but is a mode of motion

Priestley
Clergyman and experimenter, he isolated oxygen and other gases. Although he was one of the first scientists of his day, he was forced to choose exile in America because of his political views

Joseph Henry
In his lifetime he was famous as a scientific administrator; today he is also known as a great scientist. He discovered induction before Faraday and radio waves long before Hertz