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Camouflage - Miscellaneous - One of the emplacements from the front, giving an idea of the roof of the dugout, of the size of the opening, in consequence of field of fire. It should be noted, in the construction of emplacements, that the larger the aperture, the more imperfect is the concealment and that the exposure of batteries is being brought close to the line for a given field of fire is made less safe not only by their approach to the enemy, but by the increased difficulty in the constuction and concealment of their position

Photographer: Major Francis T. Colby, U.S.A. Camouflage - Miscellaneous Public domain photograph related to the United States in World War One, free to use, no copyright restrictions image - Picryl description

Detroit, Michigan. New method of making x-ray photographs size 4x5 inches instead of larger. Used at the Herman Kiefer Hospital for Communicable Diseases to show various stages of tuberculosis. The patient is placed in front of a flurescent screen and this screen is photographed on ordinary photographic film by means of a lens of larger aperture

Public domain photograph of 1930s industry, war production in the United States free to use, no copyright restrictions image - Picryl description

Chrysler tank arsenal. This is a milling operation. The four-pound metal piece with the aperture is actually the turret for a 37 mm anti-aircraft gun, part of the equipment for an M-3 tank. Extreme accuracy is required in the milling of these parts, because it is important that they be able to move freely. The gun is designed for straight away shooting, as well as serial shooting. The twenty-eight ton M-3 tanks are made in Detroit, at the huge Chrysler tank arsenal

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

Skioptikonbild från Institutionen för fotografi vid Kungliga Tekniska Högskolan. Använd av professor Helmer Bäckström som föreläsningsmaterial. Bäckström var Sveriges första professor i fotografi vid Kungliga Tekniska Högskolan i Stockholm 1948-1958.Genom bländaröppningen A B C D parallellt med optiska axeln O F infallande strålknippet efter brytning förenas i en punkt F (brännpunkten), under det att det med den snett infallande strålen O H parallella strålknippet icke har någon bestämd brännpunkt.

Skioptikonbild från Institutionen för fotografi vid Kungliga Tekniska Högskolan. Använd av professor Helmer Bäckström som föreläsningsmaterial. Bäckström var Sveriges första professor i fotografi vid Kungliga T More

Ernest Orlando Lawrence, William Brobeck, Harold Fidler, and Donald Cooksey in the aperture of a Bevatron magnet section. Photograph taken November 22, 1950. See also 434-LB-5-XBD9606-02954.TIF

Digital Preservation File Name and Format: 434-LB-5-XBD201208-00490.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

Ernest Orlando Lawrence, William Brobeck, Harold Fidler, and Donald Cooksey in the aperture of a Bevatron magnet section. Photograph taken November 22, 1950. See also 434-LB-5-XBD201208-00490.TIF. Misc.-661

Digital Preservation File Name and Format: 434-LB-5-XBD9606-02954.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

Focusing grid, exit aperture for bevatron linac.Photograph taken June 14, 1954. Bevatron-763. ZN-1000

Digital Preservation File Name and Format: 434-LB-6-XBD201310-04038.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

Workers checking to see whether there is sufficient clearance to slip the vacuum tank down into the mating aperture in the lower coil. It fit with room to spare. Photograph taken June 1, 1957. Bubble Chamber-270

Digital Preservation File Name and Format: 434-LB-6-XBD201210-01377.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

Quadrant 3, 28-degree beam aperture. Photograph taken May 21, 1958. Bevatron-1553

Digital Preservation File Name and Format: 434-LB-6-XBD201304-02493.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

4-jaw aperture and beam transformer housing assembly - Bevatron Injector II. Photograph taken December 20, 1961. Bevatron-2565 – Photographer: Doug McWilliams

Digital Preservation File Name and Format: 434-LB-6-XBD201303-02026.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

4-jaw aperture and beam transformer housing assembly - Bevatron Injector II. Photograph taken December 20, 1961. Bevatron-2562 – Photographer: Doug McWilliams

Digital Preservation File Name and Format: 434-LB-6-XBD201303-02025.TIF Photographs Documenting Scientists, Special Events, and Nuclear Research Facilities, Instruments, and Projects at the Berkeley Lab

A couple of cameras sitting next to each other. Film equipment classic, science technology.

A set of three cameras sitting on a table / The camera is a very simple, but very simple, but it's a good thing to do with the lens / Public domain art photo.

A camera and an object on a table. Iphone ios iphoto, backgrounds textures.

Group of people. Free images of people. Use free photos of people without any copyright restrictions.

A camera and an object on a white surface. Iphone ios iphoto, backgrounds textures.

Group of people. Free images of people. Use free photos of people without any copyright restrictions.

A black and silver camera sitting on top of a table. Film equipment classic, science technology.

The leica m5 camera is a compact, compact, compact, and compact / The camera is a very rare camera / Public domain art photo.

A black and white photo of a camera. Iphone ios iphoto, backgrounds textures.

Group of people. Free images of people. Use free photos of people without any copyright restrictions.

Lear Jet 24B (NASA-705) in flight along California coast is used primarily as a high altitude observation platform carrying a 12' telescope with a special hatch on the starboard side for upward viewing. The hatch has a maximum circular clear aperture of 37.6 cm and can contain a 30 cm aperture open-port gyro-stabilized telescope designed especially for infrared astronomical research. ARC-1975-AC75-0089-19

Lear Jet 24B (NASA-705) in flight along California coast is used primarily as a high altitude observation platform carrying a 12' telescope with a special hatch on the starboard side for upward viewing. The ha More