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Measure and Weight
How long is the Spiral Ramp? How much does the Round Tower weigh? How large is the Library Hall? Get the answers to these questions and learn much more about the measure and weight of the Round Tower here.
Height of the Tower
Street to platform: 34.8 m
The Spiral Ramp
Turns: 7.3 (today)
(originally 7.8 (today under the wooden staircase)
Outher length: 281 m (originally 300 m)
Innter length: 93.5 m (originally 100 m)
Outer gradient: 10 %
Inner gradient: 33 %
Elevation per turn: 3.74 m
Centre to the outer wall of the core: 195 cm
Centre to the inner wall of the outer wall: 610 cm
Radius: 768 cm
The Library Hall
Floor-to-ceiling height: 3,85 m
Area: 811 m²
Volume: 3121.5 m³
Weight of the air in the hall: 3.758 t
Staircases
Wooden staircase: 28 steps
Stone staircase: 31 steps
The Observatory
Height: 7 m
Radius: 3 m
The Platform
Area: 104.5 m²
More curious information
12° 34′ 32.25″ East
55° 40′ 52.81″ North
Weight: 5914 t
(density of fired clay + bricks: c. 2 t/m³)
