Talk:Waterline

Aircraft

I was wondering about a waterline on an aircraft, I know it exists becuase I've worked with a few manufacturing compaines. But is there an Aerospace Engineer that can really defline it strongly?— Preceding unsigned comment added by Starflight78 (talk • contribs) 17:30, 8 October 2006

Please add Full definition of the markings

This Article really helped me - Thankyou. Is it possible to put a Full defenition of the markings on a Plimsoll line, explaining the amount of Upthrust and buoyancy each type of water Provides? It would be even more useful then! Blondie448 15:56, 31 March 2007 (GMT)

I believe that the types (densities) of water do not actually change actual buoyancy. From Buoyancy, "Thus the magnitude of the buoyant force is simply equal to the weight of the displaced fluid." Going from water densities 1.000 (fresh) to 1.025 (salt) and anywhere in between changes draft and volume of water displaced but the weight of the water displaced is the same as long as the weight of the vessel remains the same. The height of the center of buoyancy (KB) will change when using the formula of KB=.53*draft. But the sum of the buoyant forces on the hull will remain the same while the center of buoyancy and drafts change.KubalaC (talk) 02:40, 14 May 2008 (UTC)

buttock lines

I don't think this line deserves its own page. Perhaps a page describing the coordinate systems and slicing of a ship in order to come up with the lines drawing (no clue what the name of such an article might be), but the buttock line is really just a definition.

I took a couple semester of Naval architecture so I could write such an article, but I don't know what to call it. It might even fit under a subsection of another page. Suggestions?--Dj245 04:16, 3 December 2007 (UTC)

coffin ships

Coffin ships are mentioned in the see also section, but I would have thought they would rate at some mention in the history section of this article. I was under the impression that it was a spate of these that led to Mr Plimsoll inventing the line. — Preceding unsigned comment added by 136.154.22.22 (talk • contribs) 00:34, 27 September 2010

Missing

I agree with the previous poster, there is a lack of information on the rationals behind the need for inventing the line, and why Mr Plimsoll was relevant. This has to be with the intentional overloading of vessels so to profit from the sinking. What started as a need to correct errors ended as a need to prevent a crimanal practice with the aim of profit. --79.168.11.181 (talk) 02:24, 7 December 2011 (UTC)

CM?

Anybody know what classification society is CM? We have a picture of a CM mark, but in our short list of societies later in the article, don't mention it. It's not listed at Classification_society#List_of_classification_societies either. -- RoySmith (talk) 01:24, 27 December 2011 (UTC)

I started a new thread at Talk:Classification_society#Are there lists of Classification societies? asking about "CM" and more. --Marc Kupper|talk 00:57, 22 January 2013 (UTC)

Plimsoll line character

In this edit, Wtshymanski removes the Plimsoll line symbol (⦵) from the article. Argumenting: "random unpronounceable glyphs in line with text are very hard to read". IMO, the Plimsoll line symbol cannot be called random in article Plimsoll line. Unpronounceable may apply to almost each and every image and so for this symbol, but I don't see why that cannot be embedded as it was (e.g., bracketed right after its verbose descripion). In fact, many, many symbols have this feat, often even the reason why they are a symbol not speakable descriptions. After all, the unpronouncable Plimsoll line symbol itself is used on ships, not its verbose very pronounceable description. For those readers who now miss the opportunity to see and copy/paste the symbol as character: it's U+29B5 ⦵ CIRCLE WITH HORIZONTAL BAR (⦵). -DePiep (talk) 06:16, 9 January 2019 (UTC)

Illustrations belong in illustrations. Glyphs inserted in the text are unreadable. This is the .EN version of Wikipedia, not the hieroglyphic version. --Wtshymanski (talk) 15:22, 9 January 2019 (UTC)

Glyphs in text are significant when the article is about that glyph. Even though this symbol is 'CIRCLE WITH HORIZONTAL BAR' and not specifically anything to do with Plimsoll (and it's, by definition, not the 'Plimsoll line') we should still keep it.

Also, sparklines show just another deliberate use of imagery inlined with body text. And I'll take my lead on information design from Tufte any day. Andy Dingley (talk) 15:38, 9 January 2019 (UTC)

• 3RR edit-warring is not the way to proceed here. Andy Dingley (talk) 15:57, 9 January 2019 (UTC)

I'm old fashioned. I like my cartoons on the funny page, not in-line in my encyclopedia articles. --Wtshymanski (talk) 19:19, 9 January 2019 (UTC)

• It's not a cartoon, it's a symbol. This is an article, in part, about that symbol.

If this was an article on boats (or aubergines) and it was using a cartoon emoji of a boat (or aubergine), then you'd have a point. But it's not. It's using a unicode version of that glyph (or damned close to it, within font-to-font variation) to discuss that same symbol. That's no caricature, that's a comparable representation, thus valid to keep here. Andy Dingley (talk) 19:53, 9 January 2019 (UTC)

C, C1, C2. What are they?

The last part of the article discusses passenger subdivisions P1, P2, P3, but the image below the text shows subdivisions C1, C2, etc.

I can't see these "C" marking described anywhere in the article. Have I missed it or is this an omission?

Marchino61 (talk) 00:50, 26 June 2019 (UTC)

The plimsoll line is not the waterline

This article says the plimsoll line and waterline are the same thing. They are not. The waterline is the intersection of the hull and the water surface. The plimsoll line is a maximum lading mark that only coincides with the waterline when the craft is fully laden - and then only at one point.

The two concepts should be treated separately, and would probably be better in separate articles. SLR Ellison (talk) 18:32, 2 January 2021 (UTC)

Additionally, in naval architecture, a waterline can mean any line on the hull surface that is in a plane parallel to the surface of the water when the hull is in equilibrium in calm water. In other words, a waterline is one of a "ship's lines" - the contours that show the shape of a hull.ThoughtIdRetired (talk) 19:23, 2 January 2021 (UTC)