This is an old 1872 print of the floating dock in British Era Bombay, now Mumbai. The clip is from an 1872 French newspaper, translated it reads “English India – Bombay Floating Dock.” It was also called hydraulic lift graving dock on which repair work of primarily troopships took place. This dock was based in Hog island (Nhave) near Bombay harbour in the 19th century.
Read more- Hog Island Hydraulic Lift.