Hendrik Zwaardemaker was a Dutch scientist who invented the olfactometer in 1888. In addition to his work on the sense of smell, he also conducted research on the human heart. He found that salts of potassium and other radioactive elements stimulated the heart. Wikipedia
The definitive Wikipedia entry for Hendrik Zwaardemaker. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Hendrik_Zwaardemaker
