The Machinery prints series is comprised of images of Schramm air compressors and their use in construction. The series is arranged into seven subseries: Construction activities, Construction pneumatic tools, Military contracts, Portable air compressors, Rotary drills, Self-propelled compressors, and Stationary air compressors. Schramm air compressors are described by product name. The images date from 1908 to 1999, with the majority from the 1930s through the 1980s.

The Construction activities subseries consists of photographic prints, slides, and negatives that depict Schramm air compressors used in construction and related activities. These include asphalt and concrete breaking, backfilling and tamping, dam construction, demolition work, exploratory drilling, power line transmission, road construction, transmission line installation, and underground pneumatic boring. The images show the construction of the Washington Metropolitan Area Transit Authority, demolition work on the executive offices of the White House, and trail construction at Grand Canyon National Park.

The Construction pneumatic tools subseries consists of photographic prints of air tools produced by Schramm. These include diggers and tampers, paving breakers, rock drills, and the “Magic Mole” pneumatic underground boring tool.

The Military contracts subseries consists of photographic prints of Schramm air compressors used by the U.S. Department of Defense. These include Pneumadiesels, Pneumatractors, Pneumapowers, Powairs, Rotadrills, and skidded air compressors.

The Portable air compressors subseries consists of photographic prints and color negatives of mobile air compressors. These include the first Schramm air compressor, Pneumadiesels, Pneumapowers, Powairs, truck-mounted outfits, and air compressors by model number.

The Rotary drills subseries consists of photographic prints and negatives of Schramm Rotadrills, organized by model number. There are also some demonstration and promotional materials.

The Self-propelled compressors subseries consists of photographic prints and negatives of Schramm Pneumatractors, organized by model number.

The Stationary air compressors subseries consists of photographic prints and negatives of Schramm air compressors, organized by model number.