Drilling Bolt Holes on the 140 Foot Telescope
The equatorial ring of the 140-foot (43-meter) telescope is a section of a 42-foot diameter circle. Its bronze gear was assembled from 28 separate segments that had to be accurately attached to the 3-million pound yoke. In this photo, engineers guide the massive drill into the equatorial ring of the 140-foot telescope in order to create the bolt holes.
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