Old Vintage Cameras: Pennsylvania Railroad Padlock

Friday, November 10, 2017

Pennsylvania Railroad Padlock

Sought after Pennsylvania Central Railroad collectible Adlake Padlock PC74 in good condition. Includes Padlock, Matching Key, and Chain. This collectible is used, sold as is, as shown. PC 74 is stamped on back which represent the Pennsylvania Central Railroad line. Lock opens and secures as should. All A Board !

What is a Camera Obscura?

The camera obscura (Latin; camera = vaulted chamber | obscura = dark, thus darkened chamber or room) is an optical device that projects an image of its surroundings on a screen. It is used in drawing and for entertainment, and was one of the inventions that led to photography. The device consists of a box or room with a hole in one side. Light from an external scene passes through the hole and strikes a surface inside where it is reproduced, upside-down, but with color and perspective preserved. The image can be projected onto paper, and can then be traced to produce a highly accurate representation. Using mirrors, as in the 18th century overhead version (illustrated in the History section below), it is possible to project a right-side-up image. Another more portable type is a box with an angled mirror projecting onto tracing paper placed on the glass top, the image being upright as viewed from the back. As a pinhole is made smaller, the image gets sharper, but the projected image becomes dimmer. With too small a pinhole the sharpness again becomes worse due to diffraction. Some practical camera obscuras use a lens rather than a pinhole because it allows a larger aperture, giving a usable brightness while maintaining focus.

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Friday, November 10, 2017

Pennsylvania Railroad Padlock

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Friday, November 10, 2017

Pennsylvania Railroad Padlock

Vintage Railroad Padlock Pennsylvania Central Collectible

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Kodak News Releases

Random Photo

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George Eastman House Blog

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APUG

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Polaroid.com Latest Press