Word: scaffolding
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Dates: during 1950-1950
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...rotating walls. Electric power, stepped up by generators, operates the instrument and moves the walls along their built in track. Since all the operations can be directed by a set of pushbuttons attached to a lengthy cable, a single person can control all the machinery, including the moving observer scaffold, from anywhere in the room. Two or three times a year, the 1600-pound lens gets a cleaning, and is re-silvered. Because of its size it cannot be aluminum coated--there is no tank in this part of the country big enough...