process plate

noun

(historical) A plate prepared by a mechanical process, especially a photomechanical process.

The process plate is used to document the steps of a manufacturing process.

意味（1）

(historical) A plate prepared by a mechanical process, especially a photomechanical process.

意味（2）

(historical) A very slow photographic plate, giving good contrasts between highlights and shadows, used especially for making lantern slides.