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Defense housing, Erie, Pennsylvania. This excavator can dig foundation for two four-unit buildings in eight hours, an operation that would require several days by hand. Foundations go down five feet for cement support blocks. The ground between the foundation blocks is later forked preparatory to receiving a cinder filling. Since there is no basement, the cinders afford a solid base for concrete flooring

Defense housing, Erie, Pennsylvania. This excavator can dig foundation...

Public domain photograph of Pennsylvania in 1930s, free to use, no copyright restrictions image - Picryl description

Assembling excavator scoop. Keystone Drilling Company, Beaver Falls, Pennsylvania

Assembling excavator scoop. Keystone Drilling Company, Beaver Falls, P...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

Northern views. Athlit. Excavator's camp in foreground

Northern views. Athlit. Excavator's camp in foreground

Picryl description: Public domain historical photo of camp, free to use, no copyright restrictions image.

Power excavator in shovel assembly room. Keystone Drilling Company, Beaver Falls, Pennsylvania

Power excavator in shovel assembly room. Keystone Drilling Company, Be...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description