The gasholder house at Erdberg is perfectly circular, and has an internal
diameter of 63.410 meters. It is constructed, in three stories, with forty
piers projecting on the outside, and with four rows of windows between the
piers--one in each of the top and bottom stories, and two rows in the
middle. These windows have a height of 1.40 meters in the lowest circle,
where the wall is 1.40 meters thick, and of 2.90 meters in the two top
stories, where it is respectively 1.11 meters and 0.90 meter thick. The top
edge of the wall is 35.35 meters above the base of the building, and 44.39
meters from the bottom of the tank; the piers rising 1.60 meters beyond the
top of the wall. The highest point of the lantern on the roof will thus be
48.95 meters above the ground.