LETTER OF SUBMITTAL. WASHINGTON, D. C., October 2, 1913. SIR: I have the honor to submit herewith a report upon the Measurement of Vessels for the Panama Canal. The report is made pursuant to instructions received from the Secretary of War, September 1, 1911, "to formulate rules and regulations governing the measurement of ships going through the canal, and to make an investigation and recommendation regarding the tolls to be charged." A report upon Panama Canal Traffic and Tolls was submitted to the Secretary of War, August 7, 1912, and the rates of toll recommended in that report were established by a proclamation of the President, issued November 13, 1912. The proclamation fixing tolls also announced that "The Secretary of War will prepare and prescribe such rules for the measurement of vessels and such regulations as may be necessary and proper to carry this proclamation into full force and effect." The report herewith submitted considers in detail the problems of tonnage and vessel measurement, and contains a set of rules which it is recommended be followed in determining the tonnage upon which Panama Canal tolls shall be paid. The principles upon which the rules are based are discussed in the report, and reasons are given for each of the main provisions contained in the code of rules recommended. The introductory chapter presents a short summary of the report and the concluding chapter contains a brief explanation of the main features of the proposed Panama measurement rules. In preparing this report I have been greatly aided by my assistant, Grover G. Huebner, Ph. D., of the University of Pennsylvania, whose cooperation has made possible the collection, analysis, and presentation of much of the detail embodied in the report. My thanks are due to Chief Constructor Richard Morgan Watt and other officers of the Bureau of Construction and Repair Department of the Navy, who have cooperated in drafting the rules to determine the tonnage upon which warships shall pay tolls; and I am also indebted to Mr. James H. Mancor, Principal Surveyor, United States and Canada, for Lloyd's Register of Shipping, and to Mr. Hugo P. Frear, Naval Architect, to both of whom the proposed measurement rules were submitted for criticism. Very respectfully, The SECRETARY OF WAR. EMORY R. JOHNSON, Special Commissioner on Panama Canal Traffic and Tolls. VIII. The necessity for special Panama measurement rules.... V. Net tonnage.. VI. Displacement tonnage the basis of tolls upon warships.... IX. Deductions for propelling power; history and criticism of rules..... X. Propelling power deductions for vessels equipped with oil and gas engines............. 71 Part II.-PRINCIPLES CONTROLLING PANAMA MEASUREMENT RULES. 97 107 115 125 143 163 185 199 207 Bibliographical note and list of principal works consulted.... 215 Part III.-RULES FOR THE MEASUREMENT OF VESSELS FOR THE PANAMA CANAL. Deductions from the gross tonnage to ascertain the net tonnage.... 3. Midship section of web frame steamer having cellular double-bottom, lower deck dispensed with 4. Midship section of a steamer with three decks and a shelter deck, lower deck dispensed with.. 5. Profile of a two-deck ship with forecastle, bridge, and poop... 6. Profile of a raised quarter-deck, well-deck steamer . 7. Profile of a two-deck, "well"-deck steamer. 8. Profile of a steamer having lower, main, and "shelter" decks. 9. Profile of a steamer with three decks and a "shelter" deck. 11. Midship section of freight and passenger vessel, Panama Canal service.. 12. Profiles of triple-screw steamship, designed for the Panama Canal service.... 13. Midship section of typical coastwise steamer for Panama Canal service . |