Register Tonnage and its Measurement, Page 228 
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228 REGISTER TONNAGE AND MEASUREMENT Riddle of the Royal Hospital, Greenwich, was recommended to Parliament and duly enacted12 in 1835 to go into effect in January 1836. It was a curious combination of precise and ruleof thumb measurements. When measuring for registry the hold had to be cleared and the following procedure employed: Divide the length of the upper deck between the after part of the stem and the forepart of the sternpost into six equal parts. Depths: At the foremost, the middle, and the aftermost of those points of division, measure in feet and decimal parts of a foot the depths from the under side of the upper deck to the ceiling at the limber strake. In the case of a break in the upper deck, the depths are to be measured from a line stretched in a continuation of the deck. Breadths: Divide each of those three depths into five equal parts, and measure the inside breadths at the following points videlicet, at onefifth and at fourfifths from the upper deck of the foremost and aftermost depths, and at twofifths and four fifths from the upper deck of the midship depth. Length: At half the midship depth measure the length of the vessel from the after part of the stem to the forepart of the stern post; then to twice the midship depth add the foremost and the aftermost depths for the sum of the depths; add together the upper and lower breadths at the foremost division, three times the upperbreadth and the lower breadth at the midship division, and the upper and twice the lower breadth at the after division, for the sum of the breadths; then multiply the sum of the depths by the sum of the breadths, and this product by the length, and divide the final product by three thousand five hundred, which will give the number of tons for register. If the vessel have a poop or half deck, or a break in the upper deck, measure the inside mean length, breadth, and height of such part thereof as may be included within the bulkhead; multiply these three measurements together, and dividing the product by 92.4, the quotient will be the number of tons to be added to the result as above found. In order to ascertain the tonnage of open vessels, the depths are to be measured from the upper edge of the upper strake.13 Thus for the first time certain deck erections were included in the tonnage figure. The divisors 3500 and 92.4 were chosen to bring the average tonnage of vessels as measured by the new rule to the same figure as the average tonnage measured by B.O.M.; obviously individual vessels would show considerable variation above and below the average, and builders soon found ways to arrange that this variation would be well on the low 12 5 and 6 Wm. IV., c. 56; reenacted in 8 and 0 Viet., c. 89. The quotations are from A Practical Digest of the Law of Merchant Ships (London: Pelham Richardson, 1847), pp. 1622. 13 When measuring for purposes other than registry, the hold being encumbered with cargo, the following rule could be used: 'Measure first the length on the upper deck between the after part of the stem and the forepart of the sternpost; secondly, the inside breadth on the underside of the upper deck at the middle point of the length; and, thirdly, the depth from the underside of the upper deck down the pumpwell to the skin; multiply these three dimensions together, and divide the product by one hundred and thirty, and the quotient will be the amount of the register tonnages of such ships.' To this the tonnage of any poop, etc., as found by the rule previously quoted, was added.
Object Description
Title  Volume V. No. 3 July 1945 
Description  Articles include: 'The Fleet' by Sidney G. Morse; Voyage of the Brig Nabob from Boston to Batavia, Java, in 1833 From a letter by Captain George W. Putnam, of Salem, to his sisters Edited by Ralph Newell Thompson; The Dismal Swamp Canal by Alexander Crosby Brown; Register Tonnage and its Measurement by John Lyman; and Mutton Spankers and Ringtail Topsails by Captain P. A. McDonald. Documents, News, and Book Reviews are also included. 
Date  1945, July 
Subjects  Amphibious warfare; Brigantines; Brown, Alexander Crosby, 1905; Canals; Dismal Swamp Canal (N.C. and Va.)—History; Dugout canoes; Lake Drummond (Va.); Letter writing; Letters; Lyman, John, Dr., 19151977; Marine canvas work; Masts and rigging; McDonald, P. A., Captain; Morse, Sidney G. (Sidney Gilbert), 19031982 ; Naval architecture; Naval history; Privateering; Putnam, George W.; Sailing ships; Seafaring life; Ships – Measurement; Thompson, Ralph Newell; Tilden, Bryant P. (Bryant Parrot), 17811851; Tonnage – Measurement – Law and legislation; United States. Continental Navy; United States. Navy – History; United StatesHistoryRevolution, 17751783Naval operations; Voyages and travels; Washington, George, 17321799 
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, Page 228 
Author  John Lyman 
Description  228 REGISTER TONNAGE AND MEASUREMENT Riddle of the Royal Hospital, Greenwich, was recommended to Parliament and duly enacted12 in 1835 to go into effect in January 1836. It was a curious combination of precise and ruleof thumb measurements. When measuring for registry the hold had to be cleared and the following procedure employed: Divide the length of the upper deck between the after part of the stem and the forepart of the sternpost into six equal parts. Depths: At the foremost, the middle, and the aftermost of those points of division, measure in feet and decimal parts of a foot the depths from the under side of the upper deck to the ceiling at the limber strake. In the case of a break in the upper deck, the depths are to be measured from a line stretched in a continuation of the deck. Breadths: Divide each of those three depths into five equal parts, and measure the inside breadths at the following points videlicet, at onefifth and at fourfifths from the upper deck of the foremost and aftermost depths, and at twofifths and four fifths from the upper deck of the midship depth. Length: At half the midship depth measure the length of the vessel from the after part of the stem to the forepart of the stern post; then to twice the midship depth add the foremost and the aftermost depths for the sum of the depths; add together the upper and lower breadths at the foremost division, three times the upperbreadth and the lower breadth at the midship division, and the upper and twice the lower breadth at the after division, for the sum of the breadths; then multiply the sum of the depths by the sum of the breadths, and this product by the length, and divide the final product by three thousand five hundred, which will give the number of tons for register. If the vessel have a poop or half deck, or a break in the upper deck, measure the inside mean length, breadth, and height of such part thereof as may be included within the bulkhead; multiply these three measurements together, and dividing the product by 92.4, the quotient will be the number of tons to be added to the result as above found. In order to ascertain the tonnage of open vessels, the depths are to be measured from the upper edge of the upper strake.13 Thus for the first time certain deck erections were included in the tonnage figure. The divisors 3500 and 92.4 were chosen to bring the average tonnage of vessels as measured by the new rule to the same figure as the average tonnage measured by B.O.M.; obviously individual vessels would show considerable variation above and below the average, and builders soon found ways to arrange that this variation would be well on the low 12 5 and 6 Wm. IV., c. 56; reenacted in 8 and 0 Viet., c. 89. The quotations are from A Practical Digest of the Law of Merchant Ships (London: Pelham Richardson, 1847), pp. 1622. 13 When measuring for purposes other than registry, the hold being encumbered with cargo, the following rule could be used: 'Measure first the length on the upper deck between the after part of the stem and the forepart of the sternpost; secondly, the inside breadth on the underside of the upper deck at the middle point of the length; and, thirdly, the depth from the underside of the upper deck down the pumpwell to the skin; multiply these three dimensions together, and divide the product by one hundred and thirty, and the quotient will be the amount of the register tonnages of such ships.' To this the tonnage of any poop, etc., as found by the rule previously quoted, was added. 
Date  1945, July 