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Potomac Electric Power Co. Benning plant. High tension wires

Potomac Electric Power Co. Benning plant. High tension wires

Public domain photograph related to Potomac Electric Power Company, free to use, no copyright restrictions image - Picryl description

Transmission line towers and high tension lines that carry current generated at TVA's Wilson Dam hydroelectric plant, near Sheffield, Ala.

Transmission line towers and high tension lines that carry current gen...

Picryl description: Public domain image of a power dam, cascade, free to use, no copyright restrictions.

Omar Abukharma installing and testing tension bars on a horizontal pay-off machine.

Omar Abukharma installing and testing tension bars on a horizontal pay...

Forms part of a group of images documenting the daily work activities of people at Watson Machine International, a machine tool manufacturing company located at 74 Railroad Avenue, Paterson, NJ, on August 9, 1994.

Assembling the rod and caps to an engine crankshank, using a tension wrench. Picture shows a crankshaft and connecting rod assembly. Packard marine engine plant, Detroit

Assembling the rod and caps to an engine crankshank, using a tension w...

Public domain photograph of 1930s America, free to use, no copyright restrictions image - Picryl description

Transmission line towers and high tension lines that carry current generated at TVA's Wilson Dam hydroelectric plant, near Sheffield, Ala.

Transmission line towers and high tension lines that carry current gen...

Picryl description: Public domain image of a power dam, cascade, free to use, no copyright restrictions.

Omar Abukharma installing and testing tension bars on a horizontal pay-off machine.

Omar Abukharma installing and testing tension bars on a horizontal pay...

Forms part of a group of images documenting the daily work activities of people at Watson Machine International, a machine tool manufacturing company located at 74 Railroad Avenue, Paterson, NJ, on August 9, 1994.

Changing face of Europe and colonial tension, late 1945.

Changing face of Europe and colonial tension, late 1945.

Also shows Soviet-dominated countries. "503740 4-78 (541369)." "Map 2." Available also through the Library of Congress Web site as a raster image.

[Springs and devices for measuring their tension and strength]

[Springs and devices for measuring their tension and strength]

Picryl description: Public domain illustrated book page scan, engraving, free to use art, no copyright restrictions image.

Drying at top speed. Reeled away from the calendaring machine, the fresh stock rolls over towering drying racks shown here. Weighted tension bars keep the festooned sheet of new fabric taut and straight as it cools and dries. From the drying racks, the fabric travels quickly onto rolls of cloth where it is rolled onto reels small enough to handle. Firestone (General Tires), Akron, Ohio

Drying at top speed. Reeled away from the calendaring machine, the fre...

Public domain photograph of indoor, interior activity, America in the 1930s, free to use, no copyright restrictions image - Picryl description

Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Checking the tension of a piston ring by "weighing" on scales

Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Moto...

Public domain photograph - working class people, the 1930s United States, work, labor, worker, free to use, no copyright restrictions image - Picryl description

Omar Abukharma installing and testing tension bars on a horizontal pay-off machine.

Omar Abukharma installing and testing tension bars on a horizontal pay...

Forms part of a group of images documenting the daily work activities of people at Watson Machine International, a machine tool manufacturing company located at 74 Railroad Avenue, Paterson, NJ, on August 9, 1994.

Section of one of the switchyards from which high tension lines carry current generated at TVA's Wilson Dam hydroelectric plant, Sheffield vicinity, Ala. Located 260 miles above the mouth of the Tennessee River, the dam has an authorized power installation of 288,000 kw., which can be increased to a possible ultimate of 444,000 kw. The reservoir at the dam adds 377,000 acre-feet of water to controlled storage on the Tennessee River system

Section of one of the switchyards from which high tension lines carry ...

Picryl description: Public domain image of a power dam, cascade, free to use, no copyright restrictions.

Omar Abukharma installing and testing tension bars on a horizontal pay-off machine.

Omar Abukharma installing and testing tension bars on a horizontal pay...

Public domain photograph of manufacturing, industry, free to use, no copyright restrictions image - Picryl description

Government discovers method to preseve film. Folding endurance test, The flexibility is measured in this folding endurance tester. A strip of film is folded back and forth under tension until it breaks, and the number of folds it withstands is counted. Three types of films have been studied, termed accoring to the chemical process of making them, acetate, viscose, and nitrate. The acetate base proved to be very stable on heating and is considered suitable for permanent records if properly made. The nitrate base became brittle quite raipidly and is considered unsuited for record purposes. The viscose base is in an intermediate position similar to that of record papers made from ordinary bleach wood fiber, 7/8/38

Government discovers method to preseve film. Folding endurance test, T...

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

Government discovers method to preserve film. (2) Expansion and contraction, like paper and other sheet materials made from cellulose, films expand as they take up moisture and contract as they lose it, and the extent of the change is different in the two directions of them. This may cause some distortion of the image, and therefore is of particular importance where the image must be true to scale, such as in aerial photography. C.O. Pope is shown with a type of expansiveity tester used and which was designed by the Bureau of Standards. Long strips of film are suspended under constant tension in the [cabinet?] in which the humidity is varied by means of [...] solutions. The change in length is indicated [...continuously?] on a scale by means of an optical-level arrangement, 7/8/38

Government discovers method to preserve film. (2) Expansion and contra...

Public domain photograph of people, building, free to use, no copyright restrictions image - Picryl description

General view of engine assembly line, Packard plant, Detroit, Michigan. Man in foreground is checking tension on connecting rod bolt nuts. The men at the bench behind him are assembling the crankshaft and connecting rod assembly, and installing them in the engine. Packard marine engine plant

General view of engine assembly line, Packard plant, Detroit, Michigan...

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

High tension pylon in western New Jersey

High tension pylon in western New Jersey

Public domain photograph of church building, free to use, no copyright restrictions image - Picryl description

Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Motor Car Company. Checking valve springs with an Arbor press for tension

Detroit, Michigan. Assembly of Rolls Royce engines at the Packard Moto...

Public domain photograph of a woman, female portrait, free to use, no copyright restrictions image - Picryl description

Dutch Gross, ex world war veteran, trapeze artist, airplane stunt man, friend of "Spike" Conner, the famous blood donner, and the only man to fall out of an airplane at 2000 feet and live (he fell on high tension wire) Better known as "the Flying Dutchman," he has made a profession of operating businesses in one defense "boom" area after another. Now runs a small lunch room and grocery store at Kymulga, near Childersburg, Alabama

Dutch Gross, ex world war veteran, trapeze artist, airplane stunt man,...

Public domain photograph of the United States military and military-industrial complex before World War Two, 1930s, free to use, no copyright restrictions image - Picryl description

Omar Abukharma installing and testing tension bars on a horizontal pay-off machine.

Omar Abukharma installing and testing tension bars on a horizontal pay...

Public domain photograph of manufacturing, industry, free to use, no copyright restrictions image - Picryl description