Astronomical Instruments of the Imperial Observatory

A large-scale engraving within a rectangular border, depicting a partial view of a massive astronomical or mathematical instrument. On the right, a section of a large circular wheel or dial is visible, featuring concentric rings and a graduated outer scale. Two hands emerge from the top right to manipulate a sliding mechanism or sight on the rim of the wheel. In the foreground, a large drafting compass or sector, shaped like the letter 'A', stands on a flat ground. In the background, a horizon line shows a landscape with small floral or star-like clusters. The letter 'A' is prominently integrated into the design of the foreground instrument.