Hand cranked doors and flood gates. The round thing with a lever is the part they put a crank handle on to crank the lock doors open or closed a separate unit for each of the two gates. The exposed gear is the gate that controls the water

Hand cranked doors and flood gates. The round thing with a lever is the part they put a crank handle on to crank the lock doors open or closed a separate unit for each of the two gates. The exposed gear is the gate that controls the water