Photo crop exposure date: unknown.
Exposure date (or window) of subject photo: 1918
Subject: Photo crop of intersection if East Commerce and North Alamo Street. View is NNW across the intersection. Taken from the SE corner of the intersection showing the Dullnig Building. Area of interest is the semaphore, above the intersection. It would appear that this particular unit is mounted within a sliding pipe (one pipe within another). The draw line can be seen hanging from below the stop-go sign.