Making Propeller Blades

Joseph Pennell

National Gallery of Art

This is a drawing of an industrial workshop. The scene depicts an interior filled with mechanical forms and equipment commonly associated with engineering workshops or factories. Various shades of grey and black are used, creating a monochromatic representation. Large, ventilator-like structures are visible in the foreground, with pipes, tanks, and machinery extending into the background. An arched window provides some light, contrasting with the dark interior. Round disc-like objects are on tables or platforms. There are no human figures present, but the machines suggest activity. The drawing conveys depth and complexity through detailed mechanical components.