English: Evidence from Fragments A & D. Reconstructed plates and gear. (a) Photograph of Fragment A, showing pillars on the periphery of b1 and features on Spokes A, B, C, D. (b) X-ray CT of long pillar. (c–d) X-ray CT of short pillars. (b–d) are from an improved X-ray volume22. All pillars have shoulders and pierced ends. (e–h) Photographs, PTMs, X-ray CT: features on Spokes D, B, C, A, including holes, circular depressions and flattened areas. In (E), the pierced block on Spoke D is highlighted in red, with inset showing X-ray CT slice through the block. (i-l) Photograph & X-ray CT of Fragment D, showing a disk, gear and plate. (m–o), Computer reconstruction, showing b1, Strap on the short pillars; Circular Plate (CP) on the long pillars. (p) Computer reconstruction of the features in Fragment D, which we reconstruct as the epicyclic components of a Venus mechanism.