T&T: 100 ton license definition ?

[John Blackburn]

Mike, you are correct, however a little more trivia is needed to bring 
the discussion to a close.  This is dredged up from one of my first 
Navel Architecture courses way back in the 1960's.  If I'm remembering 
correctly, and given my age this is not a slam dunk given :-) back in 
the olden days a "tun" was the term used to describe the cask that was 
used to ship sherry from Spain to England.  So a measure of the carrying 
capacity of a vessel was the number of tuns it could carry and hence the 
amount of taxes/port fees etc. that could be charged against the 
vessel.  You now know more than you really needed to!

Not sure what the volume of the tun was.  100 cu ft seems on the high 
side for the cargo handling equipment back then, given that it was 
filled with wine and must of weighed a good amount.

John Blackburn
44 DeFever "Yak Rack"
Deale, MD

Mike Maurice wrote:

>This general topic area doesn't seem to be able to die a decent death, 
>so here is some additional trivia to hurt your brain.
>
>Gross tonnage is a measurement of the overall internal volume of the 
>vessel. The interpretation of this definition is subject to some 
>variation by the various maritime countries and agencies.
>
>Net Tonnage is defined loosely as the tonnage volume able to carry 
>cargo. This definition is subject to even more variety of 
>interpretation. There is less net tonnage than gross tonnage.
>
>A "TON" is defined as 100 cubic feet and in maritime circles is the long 
>ton, not the more common short ton of 2000 lbs. The long ton is 2240 
>pounds. Long tons are used in maritime because that is the weight of 100 
>cubic feet of sea water(not fresh).
>
>As you can imagine it is a lot easier to do your figures in long tons 
>when working up loading for a sea going ship.
>
>A sea going vessel generally has been measured and assigned a Gross 
>Tonnage figure. In the case of small vessels the measurement is often 
>deduced from a table that makes certain assumptions about length, beam, 
>draft and cabin size. Master/Operator licenses are generally assigned a 
>restriction based upon Gross Tonnage.
>
>
>Regards,
>Mike
>
>_____________________________________
>Capt. Mike Maurice
>Beaverton Oregon(Near Portland)
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