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Rh was about 100 feet. The central part was surmounted by an octagonal pavilion, with a dome with clock-dials east and west, and a spire with a gilt vane in the shape of a Pegasus. In the pavilion there was an octagonal room with a dial in the ceiling, showing both the time and the direction of the wind, and round the pavilion ran an octagonal gallery, north and south of which were two smaller domes with allegorical figures on the top.

The height of the walls of the central building was 37 feet, and the Pegasus was 62 feet above the ground. The two towers north and south were about 18 feet high, and had each a platform on the top surmounted by a pyramidal roof made of triangular boards, which could be removed to give a view of any part of the sky. North and south of these observatories were two smaller ones, each standing on a single pillar, and communicating with the