Gear Box, Lonaconing Silk Mill.
This mill, located at the western tip of Maryland, processed raw silk from China and Japan from 1907 until it closed without warning or notice, in June, 1957. (During WWII, it spun rayon some of which was used for ally parachutes.) The building is just as it was the day it closed, without restoration. The rows upon rows of "spinning" machines, some made of wood as well as metal, remain.
I have no idea how this machine functioned. It seems, at least on first glance, that the gears do not engage properly. Perhaps the large lever is a "clutch" that rectifies this. Regardless, it is intriguing and the classic "pinhole camera" presentation focuses our attention on this detail while reminding us that it originates from the early 20th century.