Measurement of vessels for the Panama canal
A 1913 U.S. War Department report by Emory R. Johnson on rules for measuring ship tonnage for Panama Canal tolls, printed by the Government Printing Office for canal administrators, shipowners, and maritime officials. The plates are line diagrams of hulls in profile, plan, and cross-section, with dimension arrows, lettered reference points, and hatched or orange-tinted areas marking exempt and measured spaces, useful as technical drafting motifs and schematic ship silhouettes.
