Building a lock

A lock with its two gates can be seen, the front one still under construction. In the foreground to middle ground on the right, a work place with construction workers: stonemasons, bricklayers, labourers, a two-wheeled horse cart for transporting stones. In the far right foreground three gentlemen in distinguished dress with measuring rods and plans. On this side of the canal a large barge with stone blocks. On the reverse inscription "Manteau Bonn" and "A Manteau Wüster Bonn", as well as illegible, partially removed white labels and stamps.