Ctesibius

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Ctesibius
Born285 BC
Died222 BC
Alexandria, Egypt
NationalityGreek-Egyptian
Scientific career
FieldsMathematics
Ctesibius' water clock, as visualized by the 17th-century French architect Claude Perrault ARAGO Francois Astronomie Populaire T1 page 0067 Fig16-17.jpg
Ctesibius' water clock, as visualized by the 17th-century French architect Claude Perrault

Ctesibius or Ktesibios or Tesibius (Greek : Κτησίβιος; fl. 285–222 BC) was a Greek inventor and mathematician in Alexandria, Ptolemaic Egypt. [1] He wrote the first treatises on the science of compressed air and its uses in pumps (and even in a kind of cannon). This, in combination with his work on the elasticity of air On pneumatics, earned him the title of "father of pneumatics." None of his written work has survived, including his Memorabilia, a compilation of his research that was cited by Athenaeus. Ctesibius' most commonly known invention today is a pipe organ (hydraulis), a predecessor of the modern church organ.

Contents

Inventions

Ctesibius was probably the first head of the Museum of Alexandria. Very little is known of his life, but his inventions were well known. It is said (possibly by Diogenes Laërtius) that his first career was as a barber. During his time as a barber, he invented a counterweight-adjustable mirror. Another invention of his included the hydraulis, a water organ that is considered the precursor of the modern pipe organ, of which he and his wife Thais were highly reputed players. [2] [3] He improved the water clock or clepsydra ("water thief"), which for more than 1,800 years the clepsydra was the most accurate clock ever constructed, until the Dutch physicist Christiaan Huygens' invention of the pendulum clock in 1656.

Ctesibius described one of the first force pumps for producing a jet of water, or for lifting water from wells. Examples have been found at various Roman sites, such as at Silchester in Britain. The principle of the siphon has also been attributed to him.

According to Diogenes Laërtius, Ctesibius was miserably poor. Laërtius details this by recounting the following concerning the philosopher Arcesilaus:

When he had gone to visit Ctesibius who was ill, seeing him in great distress from want, he secretly slipped his purse under his pillow; and when Ctesibius found it, "This," said he, "is the amusement of Arcesilaus."

Hydraulic clock of Ctesibius, reconstruction at the Technological Museum of Thessaloniki Ctesibius's water clock, 3rd century BC, Alexandria (reconstruction).jpg
Hydraulic clock of Ctesibius, reconstruction at the Technological Museum of Thessaloniki

Reputation

Ctesibius's work is chronicled by Vitruvius, Athenaeus, Pliny the Elder, and Philo of Byzantium who repeatedly mention him, adding that the first mechanicians such as Ctesibius had the advantage of being under kings who loved fame and supported the arts. Proclus (the commentator on Euclid) and Hero of Alexandria (the last of the engineers of antiquity) also mention him.

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References

  1. Encyclopædia Britannica: Ctesibius. "Greek physicist and inventor, the first great figure of the ancient engineering tradition of Alexandria, Egypt."
  2. Athenaeus Deipnosophistae 4.174e
  3. Leon, Vicki (1995). Uppity Women of Ancient Times. Conari Press. p. 82. ISBN   9781573240109.

Further reading