Measurement of vessels for the Panama canal
A 1913 US War Department report by Emory R. Johnson on rules for measuring ship tonnage for Panama Canal tolls, printed by the Government Printing Office for shipping officials and canal administrators. Its plates are hand-lettered line diagrams of hulls in profile, section, and deck plan, with dashed measurement lines, arrows, and labels like scupper and water ballast usable as technical drawing motifs.
