PACIFIC NORTHWEST MODIFIED PIVINC HELMETS (AND TECHNIQUES)

摘要

The diving apparatus used by most United States commercial and military divers in the 1930's and 1940's had been developed over the preceding 100 or so odd years and was the result of much study, trial and error, and hard work. The result was a surface-supplied, heavy weight outfit that included at least a tough and rugged diving dress to enclose the divers body, a copper and brass helmet and breastplate, a weight belt to counter the buoyancy of the air that filled the helmet and upper part of the dress, and weighted shoes to help keep the diver upright. In or during the time of the l930's. most divers using this equipment transitioned from hand cranked air pumps to meehanicalh driven air compressors.