Karl Gützlaff
A signal station was first built in the Bund area by the French in 1865, soon after the cession of Shanghai's foreign concession. It was rebuilt in 1884, at the time of the establishment of the Zikawei Observatory by French Jesuits. The current structure was built in 1907, and named after Karl Gützlaff. The tower signaled weather reports five times a day, and gave emergency flag signals in case of typhoon or sudden inclement weather. Its operation was discontinued in 1956.