Crust breaking machine at Permanente, Bill Gorman. Workmen are using a new machine to break the crust that developed on the molten aluminum in the reduction pots at the Permanente aluminum plant. This had been a manual process before development of the specialized machine.

Permanente Metals Corp. (Tacoma)--Employees; Aluminum industry--Tacoma--1940-1950; Laborers--Tacoma--1940-1950; Machinery;