In the 1920's to the 1920's the world was becoming industrious due to several world and local factors of which include and economic boom, the discovery of resources and the fact that it is in human nature to evolve and to seek out new opportunities.
This collection shows the industrious nature of civilisation and its relationship between and towards machines.
Most of these photographs were taken with the factor of documentation in mind. Thus the subject (the machinery or collection of machinery) is presented an taken with a human analog (usually a supervisor/worker) in the frame to have a size comparison.
Due to the fact that they are documentational/technical photos, they are shot a wider angle to fit all of the subject in, since the subject (machinery) can be quite large.
Most of the photographs are shot at a high aperture (high f-stop) to get a wide/large depth of field so that everything is in focus.