Major Fragments
Fragment A can be seen as the main fragment and contains the majority of the known mechanism. Clearly visible on the front is the large b1 gear, and under closer inspection further gears behind said gear (parts of the l, m, c and d trains are clearly visible as gears to the naked eye). The back of the fragment contains the rearmost e and k gears for synthesis of the moon anomaly, noticeable also is the pin and slot mechanism of the k train. It is noticed from detailed scans of the fragment that all gears are very closely packed and have sustained damage and displacement due to their years in the sea. The fragment is approximately 30 mm thick at its thickest point.
Fragment A also contains divisions of the upper left quarter of the Saros spiral and 14 inscriptions from said spiral. The fragment also contains inscriptions for the Exeligmos dial and visible on the back surface the remnants of the dial face itself. Finally, this fragment contains some back door inscriptions.
Fragment B contains approximately the bottom right third of the Metonic spiral and inscriptions of both the spiral and back door of the mechanism. The Metonic scale would have consisted of 235 cells of which 49 have been deciphered from fragment B either in whole or partially. The rest so far are assumed from knowledge of the Metonic cycle itself. This fragment also contains a single gear (o1) used in the Olympic train.
Fragment C contains parts of the upper right of the front dial face showing calendar and zodiac inscriptions. This fragment also contains the moon indicator dial assembly including the moon phase sphere in its housing and a single bevel gear (ma1) used in the moon phase indication system.
Fragment D contains at least one unknown gear and according to M.T.Wright possibly two. Their purpose and position has not been ascertained to any accuracy or consensus but lends to the debate for the possible planet displays on the face of the mechanism.
Fragment E was found in 1976 and contains 6 inscriptions from the upper right of the Saros spiral.
Fragment F was found in 2005 and contains 16 inscriptions from the lower right of the Saros spiral. It also contains remnants of the mechanism's wooden housing.
Fragment G is a combination of fragments taken from fragment C while cleaning.
Read more about this topic: Antikythera Mechanism, Mechanism, Fragments
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