The rail is mounted on solid twin 2 by 12 beams which are 20 feet long. There is a pair of beams on each side of the deck which supports the entire structure. Eight posts set in concrete go down 5 feet into bed rock. The deck is extremely solid and the building very heavy. Then rolled back, the telescope easily sees the area of the sky around polaris.
North is to the left.
In the background is the conventional observatory building housing the C-11. The building was constructed in situ on top of the base assembly. Details of the heavy duty rails and roller assembly can be seen in several of the photos. The internal section was installed as a wind break and to hold shelves, charts, the computer and assorted accessories. When the main doors are closed the building is very weatherproof, as it has to be in Wisconsin's harsh climate.