150:. The side plating also takes much of this stress. If there were insufficient longitudinal strength, the hull would bend and eventually "break its back." In the days of wooden ship construction, this was the only practical way to build a large ship since the inside and deck planking had to be laid longitudinally, with the deck planking laid upon transverse beams connected to the frames. Even with the introduction of iron construction, this method allowed for simplicity in construction and transverse strength in short vessels. However, as ships grew in length, longitudinal strength became increasingly important.
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In longitudinal framing, very heavy transverse frames are spaced much further apart than in traditional framing—about 12 feet (370 cm) A large number of longitudinal frames are then attached to support the shell plating. The longitudinal frames at the sides fit into notches cut into the
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extend from the face angle on the transverses to the tank top plating. Under the tank top, except for notches cut for the bottom and tank top longitudinals, the transverses are much like ordinary floor plates. The deck longitudinals furnish ample strength, even when large hatch openings must be
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are used in conjunction with light, closely spaced longitudinal members. This method, Isherwood felt, lent a ship much greater longitudinal strength than in ships built in the traditional method, where a series of closely spaced transverse frames are fitted from the keel to the sheer line, with
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transverse frames, while the ones near the bottom of the ship are sometimes made continuous between transverse bulkheads. The transverses are connected to the shell plating at heavy angles and with a tank top are cut at the margin plate. Strong
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beams. They are in two parts called floors and side frames and, while necessary, subtract from cargo space inside the ship. Longitudinal strength comes from the keel, keelson,
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Article by Sir Joseph
Isherwood about the Isherwood system. "Economy in Modern Shipbuiding—II." In
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Steel Ships: Their
Construction and Maintenance: a Manual for Shipbuilders, Students and Marine Engineers
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in early 1909, encouraged builders in a number of countries to use longitudinal framing as well.
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Some content is incomprehensible, even to a person familiar with the topic, see inline tags.
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corresponding deck beams, a method that is well suited to support longitudinal planking.
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Longitudinal framing was a known method of shipbuilding before
Isherwood. Naval engineer
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269:(New York: Shipping Publishing Company, Inc.) 22 June 1918. Retrieved 5 May 2012.
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Marinelink.com, "Joseph
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In traditional framing, transverse frames are attached at
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needs attention from an expert in Ships or
History
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