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[Interior view of a metallurgical workshop where men are removing impurities from silver]

[Interior view of a metallurgical workshop where men are removing impu...

Illus. in: Beschreibung. Franckfurt am Mayn : J. Feyerbendt, 1598. Published in: The tradition of technology : Landmarks of Western technology ... / Leonard C. Bruno. Washington, D.C. : Library of Congress, 1995, p. 46.

A black and white photo of a group of people working in a factory, Minnesota. Farm Security Administration photograph.

A black and white photo of a group of people working in a factory, Min...

Picryl description: Public domain image of industrial or agricultural worker, 1930s, 20th-century, free to use, no copyright restrictions. show less

A black and white photo of a man in a kitchen, Minnesota. Farm Security Administration photograph.

A black and white photo of a man in a kitchen, Minnesota. Farm Securit...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

A black and white photo of a factory with workers, Minnesota. Farm Security Administration photograph.

A black and white photo of a factory with workers, Minnesota. Farm Sec...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

Testing for impurities in wheat at Minnesota grain inspection dept., Minneapolis, Minnesota

Testing for impurities in wheat at Minnesota grain inspection dept., M...

Public domain photograph - historical image of Washington DC, United States, free to use, no copyright restrictions image - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in the refining furnace. Wooden pole are plunged into the molten copper; there is a great evolution of gases when this is done and the excess oxygen combines with the carbon of the the wood and passes off as carbon monoxide. This refining of blister copper is based upon the fact that oxygen has a stronger affinity for the impurities in the charge that it has for copper

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in t...

Public domain photograph - Montana Folklife collection, ethnography, United States, free to use, no copyright restrictions image - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced: one, the matte which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Title and other information from caption card. Transfer; United States. Office of War Information. Overseas Picture Division. Washington Division; 1944. More information about the FSA/OWI Collection is availabl... More

Production. Milling machines and machine castings. Pouring a large mold is a fiery sight. To the left, flames are shooting from an escape hole -- caused by gas generated by the contact of iron with the relatively cool sand, graphite, linseed oil and other ingredients involved in the mold structure. The man at the left is wielding a skimmer to hold back any impurities floating on the surface of the ladle iron

Production. Milling machines and machine castings. Pouring a large mol...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

Quaker State Refining Company, Oil City, Pennsylvania. Here is the crude-stripping tower, one of the many steps in the manufacture of the lubricants of war. Thousands of gallons of crude oil pour through this tower daily; it is here that impurities are extracted. Only the best oil is used for military purposes

Quaker State Refining Company, Oil City, Pennsylvania. Here is the cru...

Public domain photograph of the 1930s-1940s World War Two, armed forces, military production, no copyright restrictions image - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced; one, the matte, which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Title and other information from caption card. Transfer; United States. Office of War Information. Overseas Picture Division. Washington Division; 1944. More information about the FSA/OWI Collection is availabl... More

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced: one, the matte which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Title and other information from caption card. Transfer; United States. Office of War Information. Overseas Picture Division. Washington Division; 1944. More information about the FSA/OWI Collection is availabl... More

A black and white photo of a group of people in a kitchen, Minnesota. Farm Security Administration photograph.

A black and white photo of a group of people in a kitchen, Minnesota. ...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

Licensed grain inspector testing wheat for impurities, Minneapolis, Minnesota

Licensed grain inspector testing wheat for impurities, Minneapolis, Mi...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

A black and white photo of a man preparing food, Minnesota. Farm Security Administration photograph.

A black and white photo of a man preparing food, Minnesota. Farm Secur...

Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description

A black and white photo of a man sitting at a table, Minnesota. Farm Security Administration photograph.

A black and white photo of a man sitting at a table, Minnesota. Farm S...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in the refining furnace. Wooden poles are plunged into the molten copper; there is a great evolution of gases when this is done and the excess oxygen combines with the carbon of the wood and passes off as carbon monixide. This refining of blister has a stronger affinity for the impurities in the charge than it has for copper

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in t...

Public domain photograph - Montana Folklife collection, ethnography, United States, free to use, no copyright restrictions image - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced: one, the matte which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Picryl description: Public domain image of an industrial building, warehouse, depot, train station, 19th-20th century, free to use, no copyright restrictions.

A group of people sitting around a table in a room, Great Depression. FSA/OWI Photograph

A group of people sitting around a table in a room, Great Depression. ...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

The molten stream pouring from the thirty-five ton electric furnace is slag-waste material melted down during the process of refining. It is composed largely of limestone, which carries with it various other impurities in the metal. In the foreground is a huge ladle into which the molten steel will be poured after the slag has run off

The molten stream pouring from the thirty-five ton electric furnace is...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in the refining furnace. Wooden poles are plunged into the molten copper; there is a great evolution of gases when this is done and the excess oxygen combines with the carbon of the wood and passes off as carbon monoxide. This refining of blister copper is based upon the fact that oxygen has a stronger affinity for the impurities in the charge than it has for copper

Anaconda smelter, Montana. Anaconda Copper Mining Company. Poling in t...

Public domain photograph - Montana Folklife collection, ethnography, United States, free to use, no copyright restrictions image - Picryl description

A person is making something with a spoon, Minnesota. Farm Security Administration photograph.

A person is making something with a spoon, Minnesota. Farm Security Ad...

Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description

A black and white photo of a teddy bear sitting at a table, Minnesota. Farm Security Administration photograph.

A black and white photo of a teddy bear sitting at a table, Minnesota....

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced; one, the matte, which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Picryl description: Public domain image of a locomotive, train tracks, rail transportation, railroad, railway, 19th-20th century, free to use, no copyright restrictions.

A black and white photo of a man working in a factory, Minnesota. Farm Security Administration photograph.

A black and white photo of a man working in a factory, Minnesota. Farm...

Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.

A black and white photo of a man writing on a piece of paper, Minnesota. Farm Security Administration photograph.

A black and white photo of a man writing on a piece of paper, Minnesot...

Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description

A black and white photo of people in a factory, Minnesota. Farm Security Administration photograph.

A black and white photo of people in a factory, Minnesota. Farm Securi...

Picryl description: Public domain photograph of an office worker, 1930s, free to use, no copyright restrictions.

Production. Tin smelting. Acid tanks at a Southern tin smelter--the finest and most modern plant in the world. The acid is used in one of the processes of separating the tin from the impurities in the ore. Construction is still going on at this plant, which has already achieved a heavy output of the pure tin needed for countless war uses of the United Nations

Production. Tin smelting. Acid tanks at a Southern tin smelter--the fi...

Picryl description: Public domain photograph of a road works, construction, excavation, free to use, no copyright restrictions.

A black and white photo of a man working on a piece of paper, Washington DC. Farm Security Administration photograph

A black and white photo of a man working on a piece of paper, Washingt...

Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description

A black and white photo of a man sitting at a desk, Minnesota. Farm Security Administration photograph.

A black and white photo of a man sitting at a desk, Minnesota. Farm Se...

Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate, known as calcine, is moved red-hot from the roasting furnaces to the reverberatory smelting furnaces. In the reverberatory furnace the second major elimination of impurities is accomplished; in this furnace two products are produced: one, the matte which contains the precious metals and copper; the other, the slag, which contains impurities which float on the surface. The slag is poured off and sent to the dump

Anaconda smelter, Montana. Anaconda Copper Mining Company. Concentrate...

Public domain photograph of 1930s-1940s industrial development, no copyright restrictions image - Picryl description

Removing impurities from polished rice before polishing. Vacuum tubes are used in this process. Abbeville, Louisiana

Removing impurities from polished rice before polishing. Vacuum tubes ...

Public domain photograph - historical image of Louisiana, United States, free to use, no copyright restrictions image - Picryl description

A black and white photo of a factory with workers, Minnesota. Farm Security Administration photograph.

A black and white photo of a factory with workers, Minnesota. Farm Sec...

Picryl description: Public domain image of a factory, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions.

Anaconda smelter, Montana. Anaconda Copper Mining Company. Battery of converters; in near converter, copper is being poured into ladle. In the converter, impurities in the copper are removed by oxidation with air and the final product approximates 99.3% pure copper

Anaconda smelter, Montana. Anaconda Copper Mining Company. Battery of ...

Public domain image of an industrial building, factory, structure, works, 19th-20th century industrial revolution, free to use, no copyright restrictions - Picryl description