This photograph shows a 3-D model of the substrata under the Susquehanna River. The Model was made by N. Grier Parke, who was the mining engineer for the Lehigh Valley Coal Company.
This is a photograph of electric locomotives, also called "lokies," in an unidentified mine tunnel. In the photograph, the covers are removed from the battery compartments.
The photograph shows an underground electrical control panel in an unidentified mine. The electrical panel was used to recharge electrical locomotives.
This photograph shows another image of an Aldrich Pump and the operator. This Aldrich Pump was built by the Aldrich Pump Company in Allentown, Pennsylvania.