ScientificAmerican1921-02-26.jpg Scientific American 1919-05-31ThumbnailsScientific American 1919-05-31ThumbnailsScientific American 1919-05-31ThumbnailsScientific American 1919-05-31Thumbnails
Drilling rock by means of energy transmitted through a liquid column. Building construction, foundations, excavation.



Artist: J. M. Mitchell

Source: Steve Kirch, collector, and creator of this website about SCIENTIFIC AMERICAN in the past

Restoration by: magscanner