Within the collections of the York County History Center are a few photos and a much larger group of negatives of a previously unidentified product of the S. Morgan Smith Company. The introductory photo is one component of that unidentified product; it shows S. Morgan Smith Company machinists inspecting a large rotor core being finished on their 42-foot boring mill. This post provides the sources that identify the overall product as a massive axial-flow air compressor; a key component in a Supersonic Wind Tunnel, which was one of NASA’s earliest development facilities.