This interesting late 19th-century drawing by Swedish artist, Axel Kulle (1846-1908) depicts six men at a leather tannery. They’re absorbed in their work, each with their head down.
It’s unusual to find scenes of this nature and quite fascinating to unravel the activity. What are they doing? It appears the closest gentleman is working on a ladies' shoe. Perhaps all six are involved in the finishing process. Note the templates on the right-hand wall.
In 1893, when Kulle produced this drawing, he was probably living in Stockholm so perhaps it was a tannery based in the City.