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Subject: [worldcruising] Re: Tonnage
truelove39@XXX.XXX
Date: Mon Feb 12 2001 - 08:11:50 EST
The word 'tun' was originally a size of cask in which wine was shipped from
Iberia (Spain & Portugal) to England. In 1347 a tax of 3 shillings per tun
was imposed and this was called 'tonnage'. A ship's size became known by the
number of casks it could carry, and gradually the word tonnage superceded the
word burthen which had been used previously. It was found that with the
design of ships in those days that if one took the length x the breadth x the
depth of the hold under the deck and divided by 100 it was close to the
number of casks that could be held. Hence we have the "Measurement ton" of
100 cubic feet per ton still in use today.
Gross Tonnage - is the internal volume in cubic feet of the ship minus
certain spaces above the main or tonnage, deck which are called "exemptions" .
Net Tonnage - is the Gross Tonnage less certain non earning spaces and
allowances such as machinery spaces, pilothouse and crew quarters.
Displacement Tonnage - is the actual weight of the ship in long tons of 2240
lbs. The "Metric Ton" (2204 lbs.) is becoming more used.
Light Displacement Tonnage - this is when the ship is built with no cargo.
Loaded Displacement Tonnage - this is when a ship is fully loaded to the
maximum on her Summer draft in Salt Water..
Deadweight Tonnage - the difference between Light and Loaded Displacement
Tonnage.
Panama & Suez Canal Tonnages - are determined by the canal companies for fee
purposes
<credit for the foregoing belongs to Peter Stocker; gohaze@XXX.XXX>
John
Sheryl & George <caver@XXX.XXX> wrote:
> Thanks for the Crew List. When I look at my Documentation I find there is a
> 2 ton difference in my Gross and Net. Is this the load capacity of the
boat?
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