: The Jeffrey Manufacturing Company, Columbus, Ohio, operated a laboratory to conduct metallurgical tests for its foundry. Metals were tested for hardness, malleability and strength. The effects of heat on various metals was tested in the round white combustion furnaces seen on the workbench. View on Ohio Memory.
: AL00970 Subjects
: Machinery industry--Ohio; Ohio Economy--Economy--Business Places
: Columbus (Ohio); Franklin County (Ohio)