One of the artefacts ranked among the Wonders of the Ancient World is the Antikythera Mechanism, the oldest extant complex geared device, also described as the first analogue computer. Its construction was variously estimated to be about 87 BC; or…
The three largest fragments of the Antikythera Mechanism as they have been recovered from the sea by sponge divers in the early 20th century.
The largest fragment is the fragment A. 27 gears were detected inside that fragment.