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Oct. 15, 1936. Washington, D.C. "Protection against that dreaded disease Silicosis is assured underground workers with this new sand-blasting helmet developed by William P. Biggs, Safety Engineer of the Navy Department. Weighing only 43 ounces, the helmet has been tested for nearly a year in various naval stations throughout the country." Harris & Ewing glass negative. View full size.
point it at the workpiece, and sneeze.
30 minutes of work and 45 minutes of resting and cold ice packs. Yikes!
"Only" 43 ounces! Nearly 2 pounds of visual obstruction...
[Yeah, he should have calculated things better. -tterrace]
LOL! I meant to type "3 pounds".
Never caught it...
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