Thanks, Terry. I guess this is just another area of laws & commerce
where there is a lot of historical measurement baggage. (I presume
you saw the attached page in a subsequent post.)
Jim
At 8 03 06, 05:27 PM, Anon Anon wrote:
Jim Elwell wrote:
>The attached page
I did not get an attached page.
>Perhaps someone can explain the Gross Tonnage
>specification: metric unit is tons, colloquial
>unit is cubic yards. I cannot figure that one out.
Gross tonnage is enclosed volume. Net tonnage is cargo
volume. The calculation is in cubic metres and
modified by a factor. The calculation is standardised
according to the IMO 1969 convention:
http://www.imo.org/Conventions/contents.asp?topic_id=259&doc_id=685
Irish law shows the calculation:
http://www.irishstatutebook.ie/ZZSI369Y1984.html
Apparently the correct term for these values is
'tonnage' not 'tons'.
There are lots of other 'ton' related terms. Do not
confuse 'gross tonnage' with the previous term 'gross
register tonnage' (which was based on a nominal 100
cubic feet).
There are also multiple types of displacement tons
which are weight units based on weight of water
displaced.
Terry
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