Bible Dictionaries
Process Plate

Webster's Dictionary

(1):

A very slow photographic plate, giving good contrasts between high lights and shadows, used esp. for making lantern slides.

(2):

A plate prepared by a mechanical process, esp. a photomechanical process.

Bibliography Information
Webster, Noah. Entry for 'Process Plate'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/process-plate.html. 1828.