The best survey of matrix making inspection techniques is that shown in The Monotype Corporation Limited (UK) in its 1956 film 'Making Sure' At the Monotype Works: Type Faces in the Making (q.v.) and the associated number (Vol. 40, No. 3 (Autumn 1956) of The Monotype Recorder. Of course, the methods shown are only those of the English Monotype company in the postwar period.
Mergenthaler Linotype shows a little of their inspection process in their book Linotype Leadership (1930) .
Stanley. Lanston and the Microscope (1908)
Stanley, F. A. "The Microscope in the Manufacturing Plant." This appeared originally in American Machinist, Vol. 31, [number unknown] (January 16, 1908): 77-79. This article was reprinted as a chapter in C. L. Goodrich and F. A. Stanley's book Accurate Tool Work (NY: McGraw-Hill Book Company, 1912): 139-146. It discusses the use of the microscope in matrix manufacturing by the Lanston Monotype Machine Company.
The icon at left links to a scan I did from my original copy of Accurate Tool Work. It is a 50 Megabyte PDF. Below are full-resolution version of the halftones (1200 dpi RGB PNGs) and one of the drawings (600 dpi, rotated and cropped a bit). They are quite large, ranging in size from 27 to 89 Megabytes. For ordinary reading, the PDF above is more than sufficient.
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