Angle Plate: A precision holding fixture made of cast iron, steel or granite. The two principal faces are at right angles and may be slotted for holding the work or clamping to a table.

 

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Angle Plate: A precision holding fixture made of cast iron, steel or granite. The two principal faces are at right angles and may be slotted for holding the work or clamping to a table.

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

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

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

Plate Appearance: The aggregate of a player's at-bats, walks, sacrifice hits (bunts and flies) and hit by pitches.

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.

Screen Plate: Plate used in early additive forms of color photography.

Schumann Plate: Plate coated with an emulsion with so little gelatin content that the silver halide grains protrude above its surface. Used for photography in the ultraviolet region.

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).

Plates: Early photographic glass plates coated with emulsion.