![Ctesibius (Ktesibius) of Alexandria (285-222 BC), Ancient Greek mathematician and inventor who studied pneumatics. Woodcut. On the left Ctesibius sits in his room surrounded by objects he is studying, showing his interest Ctesibius (Ktesibius) of Alexandria (285-222 BC), Ancient Greek mathematician and inventor who studied pneumatics. Woodcut. On the left Ctesibius sits in his room surrounded by objects he is studying, showing his interest](https://c8.alamy.com/comp/D95KG5/ctesibius-ktesibius-of-alexandria-285-222-bc-ancient-greek-mathematician-D95KG5.jpg)
Ctesibius (Ktesibius) of Alexandria (285-222 BC), Ancient Greek mathematician and inventor who studied pneumatics. Woodcut. On the left Ctesibius sits in his room surrounded by objects he is studying, showing his interest
![Reconstruction of a clepsydra (water clock), invented by Ctesibius of Alexandria, c270 BC (1857), Stock Photo, Photo et Image Droits gérés. Photo HEZ-1157337 | agefotostock Reconstruction of a clepsydra (water clock), invented by Ctesibius of Alexandria, c270 BC (1857), Stock Photo, Photo et Image Droits gérés. Photo HEZ-1157337 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/8f66c2d89475a5f310fcd0c6e3a3d017/hez-1157337.jpg)
Reconstruction of a clepsydra (water clock), invented by Ctesibius of Alexandria, c270 BC (1857), Stock Photo, Photo et Image Droits gérés. Photo HEZ-1157337 | agefotostock
![The Greek engineer Ctesibius of Alexandria is credited with inventing the pipe organ in the 3rd century B.C. and improving the clepsydra, the most accurate clock for more than 1,800 years The Greek engineer Ctesibius of Alexandria is credited with inventing the pipe organ in the 3rd century B.C. and improving the clepsydra, the most accurate clock for more than 1,800 years](http://www.thevintagenews.com/wp-content/uploads/sites/65/2017/02/1200px-Mosaic_of_the_Female_Musicians-640x450.jpg)