Blueprints are the language by which a designer expresses his thoughts to the mechanic. They may represent some complicated machine to be made in fifty separate pieces, which will fit together like the parts of a watch.

Answers to Examination Questions, Part I and II

Blueprint Reading for the Machine Trades, Robert H. Fortman, Supervisor of Tool Design Department, The Davidson Manufacturing Corporation, Associate Member Western Society of Engineers and James McKinney, Educational Director American School, Member National Society for the Study of Education, Member American Vocational Association, American Technical Society, 1943