The appropriate definition is here, since we're talking about design:
naval architecture (
in ship construction: The naval architect)
Deadweight is defined as weight of cargo plus fuel and consumable stores, and lightweight as the weight of the hull, including machinery and equipment. The designer must choose dimensions such that the displacement of the vessel is equal to the sum of the deadweight and the lightweight tonnages. The fineness of the hull must be appropriate to the speed.
The citation you're using for 'deadweight' is for the
cargo itself, which is also valid but talks about cargo alone. (
http://www.britannica.com/EBchecked...on/66752/The-naval-architect?anchor=ref539689 ) Keep in mind, these are
seperate masses, and 'deadweight' is valid to refer to any of them. But, saying that, if you're referring to the ship itself - DW is just the ship itself.
Everything put together is 'gross weight'.
Ship's mass (DW Deadweight) + Ship's mass (DW machinery) + Sundry mass (DW Sundry) = GW.
The big problem in this citation is that various treaties and agreements have literally changed the meaning of 'deadweight' to whatever's convienient for the time (
http://www.britannica.com/EBchecked/topic/563020/standard-tonnage ). A DW reference made in 1920 literally has a different meaning than one in 1915, 1940, or 1960.
So, the question is, what did "Deadweight" mean in 1965. Ironically, this is another year where the definition changed due to union shipping rules (
http://www.clt.astate.edu/crbrown/deadweight.htm). So, g'dammit! Here, Deadweight is adopted to have
several meanings, but the nautical design, stated above, is the standard we're looking at.
The International Convention on Tonnage Measurement of Ships (
http://www.imo.org/Conventions/contents.asp?topic_id=259&doc_id=685) formally defined terms used here such as 'net tonnage', 'gross tonnage', 'displacement tonnage', and so on. Sadly, these don't quite work for our purposes, since we're discussing mass. So we're back to a colloqualism (pre-1969).
The big problem for us, really, is that blue-water ships really use displacement for measuring mass. This doesn't quite work for our needs, naturally. Our equivalent here for 'DW' would be 'DWDT' ('deadweight displacement tonnage')... only we don't really displace anything. Indeed, in 1965, this is how ships were entered in the register (
http://www.navy.mil/navydata/navy_legacy_hr.asp?id=71).
So, let's look at the "190,000MT DW" entry again. First, the 'metric ton' is listed as a
mass, and not ship's volume. We're also looking at the deadweight from a
design standpoint, not a shipping one. That means we use the 'nautical engineer's' definition. So when all the research is done, we've got the
mass of the raw vessel, sans Sundry, crew, etc, at 190,000 Metric Tonnes.
Now, the term 'gross tonnage' is a measure of volume with a pretty specific meaning, even in 1965.
(http://www.britannica.com/EBchecked/topic/246678/gross-tonnage ). So if we were indeed to take Scotty's line literally, then than '1,000,000 gross tonnes of vessel' would mean that the
Enterprise has enough
cargo space for 100 million cubic feet of cargo. (Note, this is not metric yet, obviously). To do this, the cargo area alone of the ship would have to be a solid cube of 464' on each side. This is substanially larger than any reasonable volumetric estimate of the old girl (Bad science, worse art), so it's pretty safe to toss the line out as 'Scotty being Scotty'.