30.5 MB (10.7 MB compressed)
2681 x 3981 pixels
22.6 x 33.8 cm ⏐ 8.9 x 13.3 in (300dpi)
METROPOLITAN MUSEUM OF ART / SCIENCE PHOTO LIBRARY METROPOLITAN MUSEUM OF ART / SCIENCE PHOTO LIBRARY
Peacock water clock invention, 14th century. This device operated using water power. In the completed device, the arch containing two peacocks would be surmounted by another containing a peahen that would turn from right to left over the course of half an hour, causing the peacocks to whistle. Invention from a 1315 edition of 'Book of the Knowledge of Ingenious Mechanical Devices' by Islamic scholar Ismail al-Jazari.
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