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Plate Camera: Camera designed to take glass plates but often adapted to take cut film.

One Shot Color Camera: Is an obsolete plate camera making three color separation negatives from a single exposure.

Platelets: In vertebrates, cell fragments that bud off from the megakaryocytes in the bone marrow; carry chemicals needed for blood clotting. Cell fragment functioning in blood clotting.

Plate Tectonics: The movement of the plates that make up the surface of the Earth. The revolutionary paradigm in geology that the earths crust is composed of rigid segments (plates) in constant (although con . . . View Full Definition

Plateau Basalt: A sequence of parallel to subparallel basalt flows that were formed during a geologically brief interval of time and which covered an extensive geographic area. Thought to have formed from s . . . View Full Definition

Plates: Early photographic glass plates coated with emulsion.

Reflex Camera: Camera system which uses a mirror to reflect incoming image rays on to a ground glass screen, providing a system of viewing and focusing. See also slr.

Rangefinder Cameras: Show a slightly offset image because of different alignment of lens and viewfinder.

Quarterplate: Negative or print format measuring 3 ¼ x 4 ¼ inches. It's one quarter the size of a full plate (8 ½ x 6 ½ inches).

Polaroid Camera: An instant picture camera designed for polaroid materials.