Photograph of a slow speed pump unit, an electric motor that drives the pumping unit, Santa Fe Springs Oil Field, ca.1931. A vertical metal coil can be seen at center in front of a small metal barrel-shaped object above it. A chain is visible to the right, while, "842806-1. Ideal. Automatic. Cut-Out. Switch. NSCO" can be seen written on a small placard at the bottom left portion of the machine. Tubes and wooden planks are visible at right, while what appears to be a barrel and walls can be seen in the background.