Keywords: blackandwhite monochrome black and white LC-DIG-HEC-33973: New sand-blasting helmet. Washington, D.C., Oct. 15. Protection against that dreaded disease Silieosis, 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. Photographed by Harris & Ewing, October 15, 1936. (6/19/2015). LC-DIG-HEC-33973: New sand-blasting helmet. Washington, D.C., Oct. 15. Protection against that dreaded disease Silieosis, 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. Photographed by Harris & Ewing, October 15, 1936. (6/19/2015). |