Talk:Fathom

message: As an English man born in England in 1954 and brought up in England, I have been aware since Primary School that depths of water were measured in fathoms. However no-one has ever told me why this should be; why do we measure depth in fathoms? 
In those pre-metrication days length and distance were generically expressed in combinations of inches, feet, yards and miles. Horse races were measured in furlongs, but that was about the only unusual measure in use ...apart from the fathom. It struck me as perverse that fathoms should still be in common use. There must have been a important reason.
The (to me) obvious answer occurred to me a few years ago after mowing my back lawn. As I coiled the mower cable I realised I was forming each loop of the coil from the length of cable between my two outstretched arms – my personal ‘’fathom’’. I was also aware how easy this coiling action was. I’m not particularly fit, but my left hand, (holding the growing coil) swung easily back and forward like a pendulum, balancing the action of my right hand. As my left hand stretched out, it pulled the next length of cable through my right hand (“measuring�? the “fathom�?) and as my two hands came together I made another coil. How long is my cable? Easy! Count the coils; it’s that many fathoms! How long is a rope stowed aboard ship? Count the coils; it’s that many fathoms! 
This, to me, seems an obvious explanation of why a fathom is a measure of length corresponding to the outstretched arms (see wiktionary), rather than being an mere defintion, but I’ve never heard anyone give it as a reason and I've never come across it in any book, not that I have looked too hard! Does any Wikipedian know of an authority for this idea other than me in my back garden?
Further thoughts:
* If I am correct, the determining factor for using fathoms as a unit of measurement is not that you’re at sea but that you are using rope. Have fathoms been used anywhere other than at sea because people were measuring with coils of rope? The article says fathoms were used in Cornish mines – is this the reason?
::Not just in Cornwall. It was used throughout the UK. See Scottish example at http://www.mining-villages.co.uk/252.html. --ML5 14:44, 28 May 2007 (UTC)
replies: text: Found a link for "throughout UK" and added it to ML5's correction — thanks for putting me right! --Old Moonraker 15:33, 28 May 2007 (UTC)

text: It's an interesting theory, but unfortunately, without an authoritative cite, it is mere speculation, and shouldn't be in this article. Rhialto 13:40, 15 April 2007 (UTC)
replies: text: I agree and so I hope there is someone out there who is able to cite a reference. In time, because that's how some coils of rope are (there's nothing speculative about the way I coil my mower cable!), I would consider proposing text that addresed the matter for this discussion to consider ... but before I do that I hope for a citation. Brother Francis 23:22, 15 April 2007 (UTC)
replies: text: It's because depths were originally measured using a lead sinker attached to a line. The lead was dropped over the side of the ship and allowed to bottom. The line was then hauled-in manually using the distance between the outstretched arms as a measure and the number of 'arms'-used counted. This gave the depth in measures of approximately six feet. When the person doing the sounding was lax or lazy he wouldn't wait for the sinker to bottom and would haul-in prematurely giving inaccurate readings - hence the term swinging the lead. Ian Dunster (talk) 10:05, 13 May 2008 (UTC)
replies: text: Ian Dunster's suggestion, of measuring rope as it's hauled in by counting the number of "arms", is highly persuasive: does anybody have a WP:SOURCE so it can be put in? --Old Moonraker (talk) 20:25, 13 May 2008 (UTC)

text: I included a description of this in the article back in 2004. It has been removed in the interim period. Oska (talk) 09:34, 28 May 2008 (UTC)
thread_title:  Why is depth measured in fathoms? 

message: I can't think of a better wording right now, or I'd fix it. But reading this article, mainly about a maritime measurement, on being told that it was used for the depth of mines, I naturally assumed the military kind of mine. It was only when, out of curiosity, I followed the link, that I found it concerned mineral extraction!  —Preceding unsigned comment added by 81.187.202.205 (talk) 03:01, 23 February 2008 (UTC)
replies: text: Ouch—good catch! Now fixed, using your terminology. Thanks. --Old Moonraker (talk) 22:40, 24 February 2008 (UTC)
thread_title:  Mines 

message: where do the differing numbers for some of the other fathoms come from? and is the implied accuracy of some of them really justified?Rody1990 (talk) 02:15, 2 April 2010 (UTC)
replies: text: No, it looks like WP:NOR. For example, in what context (since Moses, that is) has there ever been a comparison between measuring the height of horses using hands and the fathom? Nearly all of these could go, leaving just the ones that are actually used, for example metres and feet on maritime charts, at a realistic level of precision. --Old Moonraker (talk) 07:44, 2 April 2010 (UTC)
replies: text: going ahead and deleting the section as several of the indicated numbers seem false, and there seems little justification of their inclusion anyway (most of these are simply the same unit, but translated and somehow given a different value perhaps due to WP:NOR). if you feel this is wrong at least justify all the numbers used.Rody1990 (talk) 11:18, 13 January 2011 (UTC)
thread_title:  Other fathoms and similar units of length 

message: The section "On land" seems to include obvious errors: the expression "six foot square" means a square of side 6 ft, so 36 sq. ft., not 6 sq. ft.  I also notice that the claim about referring to amounts of wood in Britain should be past tense: the quote cited in the SOED is from 1577! And I am removing the bit about Hungary: almost exactly the same claim could be made about Japan (I happen to know), and there really is not coherent point in including such random factoids.
I'm also puzzled about "full fathom five" (see the catchphrase entry): generally it seems to be assumed that this means "five fathoms", i.e. 30 ft., but "deep six" is said to mean being buried in 6 fathoms of water, yet one fathom (i.e. 5 or 6 ft.) is said to be the burial depth on land. I can't find any authoritative-looking statement on this, but I would have guessed that if anything "full fathom five" meant a full fathom of five feet. Imaginatorium (talk) 05:37, 3 September 2016 (UTC)
replies: text: I'm an obscure unit geek, and this is literally the first time ever I have seen anyone suggest that a fathom might be exactly five feet. Definitions I have seen are either exactly six feet or exactly 6.08 feet. Rhialto (talk) 08:33, 5 September 2016 (UTC)
thread_title:  Dubious arithmetic 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: This sounds like an assumption that "English-speaking world" = "USA".  Charts produced by other English-speaking nations use metres, and have done so for many years.  Martin of Sheffield (talk) 11:11, 14 March 2023 (UTC)
replies: text: I agree completely. It is my understanding, that of the primary Anglophone nations, (Australia, Canada, Ireland, New Zealand, United Kingdom, United States) ONLY the United States still use Fathom as an official, or accepted, unit of measurement on such documents or charts... At this point some would make a point regarding Amican world views, Americentrism etc, but I shall refrain in order to maintain an even dialogue, and encourage others, on both sides, to do the same... Anyhow, I move that this section be removed entirely, or be rewritten to indicate that, of all the Anglophone nations, only the US still uses Fathom on its official documents, whereas the rest use Metres (or something like that). Any thoughts, objections, contributions etc? M R G WIKI999 (talk) 12:50, 14 April 2023 (UTC)
replies: text: I've been bold and tried to fix it to reflect the history and current position. Martin of Sheffield (talk) 13:15, 14 April 2023 (UTC)
thread_title:  "the most frequently employed maritime measure of depth in the English-speaking world"