Register Tonnage and its Measurement, Part II, Page 313 
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REGISTER TONNAGE AND MEASUREMENT 313 Having thus ascertained the transverse area at each point of division of the length of the vessels, as required above, proceed to ascertain the register tonnage [by integrating the areas along the length as already explained]; divide this product by one hundred, and the quotient, being the tonnage under the tonnage deck, shall be deemed to be the register tonnage of the vessel subject to the additions hereinafter mentioned. If there be a break, a poop, or any other permanent closedin space on the upper deck, or the spardeck, available for cargo, or stores, or for the berthing or accommodation of passengers or crew, the tonnage of such space shall be ascertained as follows: Measure the internal mean length of such space in feet, and divide it into an even number of equal parts of which the distance asunder shall be most nearly equal to those into which the length of the tonnagedeck has been divided; measure at the middle of its height the inside breadths, namely, one at each end and at each of the points of division; [then compute the mean horizontal area by the parabolic rule]; then measure the mean height between the planks of the decks, and multiply by it the mean horizontal area; divide the product by one hundred, and the quotient shall be deemed to be the tonnage of such space, and shall be added to the tonnage under the tonnagedeck, ascertained as aforesaid.32 Fig. 5· Schematic deck plan and midship section of a turret steamer. Under Suez rules the turret is treated as a deck erection, and its breadths are taken only at its ends and at the middle of the length. Since the breadths at the ends are zero, the parabolic formula assumes that the sides of the turrets are curved as shown by the broken lines, and the volume in the shaded region (nearly onethird of the total) is exempt from measurement. Turret steamers were therefore popular in trades requiring use of the Suez Canal. 32 British, Suez, and Panama Canal rules require only two divisions of length for deck structures. Under Suez rules the 'turret' of a turret steamer rates as a 'deck structure,' and almost onethird of the cargo space in the turret is exempted as shown in Figure 5.
Object Description
Title  Volume V. No. 4 October 1945 
Description  Articles include: The Mount Vernon's Voyage from Batavia to Nagasaki in 1807 by Allan B. Cole; Nathaniel Hawthorne and the Museum of the East India Marine Society by Charles E. Goodspeed; Notes of Some New England ThreeMasters by Robert H. I. Goddard, Jr.; The Dismal Swamp Canal, Part II by Alexander Crosby Brown; and Register Tonnage and its Measurement, Part II by John Lyman. Issue also includes Notes, Book Reviews, and an Index to Volumes I through V, which includes a list of vessels with compound names. 
Date  1945, October 
Subjects  Ammunition; Arms sales; Barges; Bills of lading; Brown, Alexander Crosby, 1905; Canals; Coastwise navigation; Cole, Allan B., (Allan Burnett), b. 1914; Davison, John, Captain; Deshima (Nagasakishi, Japan); Dismal Swamp Canal (N.C. and Va.)—History; Displacement (Ships); EastIndia Marine Society of Salem; Goddard, Robert H. I., Jr.; Goodspeed, Charles E. (Charles Eliot), 18671950; Hawthorne, Nathaniel, 18041864. Mosses from an old manse; Hawthorne, Nathaniel, 18041864; Indexes; Lake Drummond (Va.); Locks (Canal); Lyman, John, Dr., 19151977; Maritime contracts; Masts and rigging; Nagasakishi (Japan); Naval architecture; Nederlandsche OostIndische Compagnie; Peabody Museum of Salem; Sailing; Schooners; Ships – Measurement; Ships' papers; Steamboats; Strother, D. H. (David Hunter), 18161888; Tonnage – Measurement – Law and legislation; Ward, Malthus A. (Malthus Augustus), 17941863; 
Publisher  Peabody Essex Museum, Salem, Massachusetts 
Sponsor  This digitization project was sponsored by the Salem Marine Society. 
Format  A Quarterly Journal of Maritime History and Arts 
Publication Rights  Requests for permission to publish material from this collection must be submitted in writing to The Russell W. Knight Curator of Maritime Art and History at the Peabody Essex Museum. 
Description
Title  Register Tonnage and its Measurement, Part II, Page 313 
Author  John Lyman 
Description  REGISTER TONNAGE AND MEASUREMENT 313 Having thus ascertained the transverse area at each point of division of the length of the vessels, as required above, proceed to ascertain the register tonnage [by integrating the areas along the length as already explained]; divide this product by one hundred, and the quotient, being the tonnage under the tonnage deck, shall be deemed to be the register tonnage of the vessel subject to the additions hereinafter mentioned. If there be a break, a poop, or any other permanent closedin space on the upper deck, or the spardeck, available for cargo, or stores, or for the berthing or accommodation of passengers or crew, the tonnage of such space shall be ascertained as follows: Measure the internal mean length of such space in feet, and divide it into an even number of equal parts of which the distance asunder shall be most nearly equal to those into which the length of the tonnagedeck has been divided; measure at the middle of its height the inside breadths, namely, one at each end and at each of the points of division; [then compute the mean horizontal area by the parabolic rule]; then measure the mean height between the planks of the decks, and multiply by it the mean horizontal area; divide the product by one hundred, and the quotient shall be deemed to be the tonnage of such space, and shall be added to the tonnage under the tonnagedeck, ascertained as aforesaid.32 Fig. 5· Schematic deck plan and midship section of a turret steamer. Under Suez rules the turret is treated as a deck erection, and its breadths are taken only at its ends and at the middle of the length. Since the breadths at the ends are zero, the parabolic formula assumes that the sides of the turrets are curved as shown by the broken lines, and the volume in the shaded region (nearly onethird of the total) is exempt from measurement. Turret steamers were therefore popular in trades requiring use of the Suez Canal. 32 British, Suez, and Panama Canal rules require only two divisions of length for deck structures. Under Suez rules the 'turret' of a turret steamer rates as a 'deck structure,' and almost onethird of the cargo space in the turret is exempted as shown in Figure 5. 
Date  1945, October 