![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/65/2017/02/492px-Dion654a_ancient_organ-350x640.jpg)
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 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/Ancientlibraryalex-629x640.jpg)
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 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/AquincM6-463x640.jpg)