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Stephen Hales

medical science
Stephen Hales and the Blood Pressure

Stephen Hales and the Blood Pressure

Harald Sack
On September 17, 1677, English clergyman Stephen Hales was born. Hales made major contributions to a range of scientific fields including botany, pneumatic chemistry and physiology. He was the first person to measure blood pressure. He also invented several devices, including a ventilator, a pneumatic trough and a surgical forceps for the removal of bladder stones. In addition to these achievements was a philanthropist and wrote a popular tract on alcoholic intemperance. “We are…
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chemistry
Joseph Priestley and the Discovery of Oxygen

Joseph Priestley and the Discovery of Oxygen

Tabea Tietz
On February 6, 1804, English theologian, Dissenting clergyman, natural philosopher, chemist, educator, and Liberal political theorist Joseph Priestley passed away. Being a rather prolific author with more than 150 works published, he is usually credited with the discovery of oxygen, having isolated it in its gaseous state, although Carl Wilhelm Scheele and Antoine Lavoisier also have a claim to the discovery.[4,6] “It is known to all persons who are conversant in experimental…
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