a term used to describe the mounting of certain types of audio visual equipment - especially in outside broadcast vehicles and recording studios.

Rack mounted equipment always conforms to a standard width of 19 inches (approximately 40 cms) hence the term 19| rack mount. The height of a standard piece of 19" rack equipment is known as 1U or one unit. This can be as high as 2m3 or 4 units depending on the equipments role. ("Half U" means rack equipment that is able to it in pairs along side each other in 1 rack unit or "U"

Rack mixers are mixers designed to mount into 19" rack mounting cabinets.

shifts the area of sharp focus from one plane to another during a shot thereby directing the attention of the viewer forcibly from one subject to another.

In Marxian thought, the relationships in the productive system between producer, distributer, and consumer.

in shooting, the number of frames exposed per second; in projection, the number of frames thrown on the screen per second. If the two are same, the speed of action appears normal while a disparity will create slow or fast motion. The standard rate in sound cinema is 24 frames per second for both shooting and projection (for silent film, it used to be between 16 and 18 frames per second.)