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Wilson Alwyn Bentley (February 9, 1865 – December 23, 1931), also known as Snowflake Bentley, was an American meteorologist and photographer, who was the first known person to take detailed photographs of snowflakes and record their features. [1]
A slide is a single page of a presentation. A group of slides is called a slide deck. A slide show is an exposition of a series of slides or images in an electronic device or on a projection screen. Before personal computers, they were 35 mm slides viewed with a slide projector [1] or transparencies viewed with an overhead projector.
Rear projection (background projection, process photography, etc.) is one of many in-camera effects cinematic techniques in film production for combining foreground performances with pre-filmed backgrounds. It was widely used for many years in driving scenes, or to show other forms of "distant" background motion.
A slide copier is a simple optical device that can be fastened to the lens mount of a camera to enable slide duplicates to be made. Whilst these devices were formerly used to make duplicates on to slide film , they are often now used in conjunction with digital cameras to digitize images from film-based transparencies.
a snow effect slide can add snow to another slide (preferably of a winter scene) by moving a flexible loop of material pierced with tiny holes in front of one of the lenses of a double or triple lantern. [65] Mechanical slides with abstract special effects include: Slide with a fantoccini trapeze artist and a chromatrope border design (c. 1880)
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage. In contrast to rear projection , which projects footage onto a screen from behind the performers, front projection projects the pre-filmed material over the performers and onto a highly ...
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