Image appears to be a rotating film drying rack, possibly used for x-ray development. Fort San was known for building it's own equipment adapted for travelling TB surveys.
Hillside view of Fort San. captioned "Sanatorium Fort Qu'Appelle Sask. An accompanying letter identifies the postcards as belonging to an unnamed Aunt who was a patient at the San between 1941-1943. The letter says "her photo album shows a group of girls laughing and having a good time, she said they never talked of dying, just about what they would do when they were discharged."
