explain xkcd - User contributions [en]

Talk:2880: Sheet Bend

2024-01-13T19:49:36Z

108.162.245.83:

This comic contained material familiar to a hobby engineer that was cast critically and derogatorily (e.g. “sheety” bend) throughout the explanation. I edited a lot of it. I’ve seen this happen repeatedly in other explanations. I don’t edit most of them. [[Special:Contributions/172.71.150.155|172.71.150.155]] 18:41, 13 January 2024 (UTC)

Why is this called a "sheet" bend? [[User:SystemParadox|SystemParadox]] ([[User talk:SystemParadox|talk]]) 21:17, 12 January 2024 (UTC)
:I don't know the full answer but it's a sailing thing: the 'sheet' is the rope you pull in or let out to control the position of the sail. I guess bend describes the category of knot. [[Special:Contributions/172.70.90.48|172.70.90.48]] 21:23, 12 January 2024 (UTC)
::NO NO NO. The sheet is the sail. [[User:JohnB|JohnB]] ([[User talk:JohnB|talk]]) 21:36, 12 January 2024 (UTC)
:::It is the rope - {{w|Sheet (sailing)}}. "In sailing, a sheet is a line (rope, cable or chain) used to control the movable corner(s) (clews) of a sail." [[Special:Contributions/172.71.242.5|172.71.242.5]] 21:56, 12 January 2024 (UTC)
::::Huh. Dueling Wikipedia articles. The Sheet_bend article has a definition section that says the term "sheet bend" derives from its use bending ropes to sails (sheets). But the Sheet_(sailing) article says a sheet is a line used to control the movable corner(s) of a sail. [[User:JohnB|JohnB]] ([[User talk:JohnB|talk]]) 23:08, 12 January 2024 (UTC)
::The sheet bend is named for its ability to to secure a sail, or sheet. You fold over the corner of the sail and that's one of your "ropes". The sheet bend is generally used as a knot for tying a large, inflexible rope (or rope-like object) to a smaller, more flexible rope.[[Special:Contributions/172.69.70.22|172.69.70.22]] 22:30, 12 January 2024 (UTC)
::I would take the Ashley Book of Knots as authoritative. Sheet Bend is the first knot in the book, and is always (in modern terms) rope-to-rope, not to sail. It is one of the basic knots. https://en.wikipedia.org/wiki/The_Ashley_Book_of_Knots https://en.wikipedia.org/wiki/Sheet_bend
::{{unsigned|PRR|04:04, 13 January 2024}} 
:I added a link to the wikipedia entry, it explains the name. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 21:25, 12 January 2024 (UTC)
:Presumably the "different loads" title text is a pun between electrical load and mechanical stress on the knot? [[User:Jim-at-home|Jim-at-home]] ([[User talk:Jim-at-home|talk]]) 21:56, 12 January 2024 (UTC)

A sail is never, and was never, properly called a "sheet", since at least the 13th century. The Wikipedia explanation of the name is misleading. According to https://www.etymonline.com/word/sheet, it's "shortened from Old English sceatline "sheet-line," from sceata "lower part of sail," originally "piece of cloth," from same Proto-Germanic source as sheet (n.1)." [[User:Jlearman|Jlearman]] ([[User talk:Jlearman|talk]]) 17:44, 13 January 2024 (UTC)
: When i took a sailing class as a kid they used the word “sheet”, I think it was the lines connected to the sails used for adjusting them? [[Special:Contributions/108.162.245.82|108.162.245.82]] 19:46, 13 January 2024 (UTC)

“silver being joined to silver and gold being joined to gold within the insulating white cable” is not the conventional way to join cables.
Unless you are joining one cable to itself (like a Möbius strip), you have ''two'' cables with insulation.
And usually you use non-cursed connectors, where you first remove the insulation at the end of the cable and then crimp or solder the conductors to metal parts of the connector; or solder the conductors and then add a different type of insulation for protection; or use screw terminals;...
Only with insulation displacement connectors you keep using all the insulation of the two cables.
And finally, conductors are usually copper ''or'' aluminum, and very rarely silver ''and'' gold. --[[Special:Contributions/162.158.94.141|162.158.94.141]] 08:45, 13 January 2024 (UTC)
:I think the gold and silver is just color coded for the reader. Not that they are meant to indicate that the conductors are made from this material. Apart from that you comment sounds like you know what you are talking about. So please improve the explanation if you can. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 10:58, 13 January 2024 (UTC)
:: cables often have the signal parts copper-colored (described gold atm) and they are obviously copper, and the outer ground more the color of steel or something, not sure what metal it is, but it’s easy to solder like copper or silver is, not aluminum which is very hard to solder. usually gold and silver are used at the contacts of a connector, not inside a wire, i don’t know who would ever make that mistake. [[Special:Contributions/108.162.245.83|108.162.245.83]] 19:49, 13 January 2024 (UTC)

Okay I looked at the wikipedia article and the knot depicted in the comic looks like a right handed one. I still don't know why it's called right handed, or why the left handed one is insecure.[[Special:Contributions/198.41.236.207|198.41.236.207]] 11:46, 13 January 2024 (UTC)

A note I nearly added in the bit about short-circuits (or, as I added, 'un'circuiting) is that the electrical behaviour of the knot is different according to which 'end' slips. If the left-side cable 'slips through' enough, then its gold and silver bits of sheath could contact (would short-circuit any current driven at that side). If the right-side cable slips out, it is in no danger of doing so for a right-driven current (it would just disconnect). That ignores the cross-talking that could occur (on one conducting line at a time, so may not matter if there's no external ground-return element, except as far as not being a proper connection any more), or ''both'' ends slipping (where one of the LHS sheaths ''might'' shuffle into a position to bridge the two RHS sheaths). But, as tied, the LHS silver (being bent in and out of the page around its crossing counterpart wire) seems unlikely to be pressed against both gold and silver, should it trivially untwine/slip through. Actual studies with actual knots might be useful. I thought I had a spare length of unterminated Cat5, nearby, but apparently (k)not... that, with some coloured permanent marker-pen marks made upon it, would probably have made a decent analogue for visual analysis of failure conditions. Maybe I'll de-plug an old cable (I've got a number of damaged USB cables I could chop, but their being thinner would change the scale and dynamics of the knot, meaning I might as well just use a scrap of twisted-pair internally-sheathed strands). – But I thought you'd like my mind's-eye analysis of the knot behaviour, before I get around to trying anything practical to this end. [[Special:Contributions/141.101.99.7|141.101.99.7]] 17:08, 13 January 2024 (UTC) (<- ex Cub-/Boy-/Venture-Scout, but never got any Knot ''Un''tying badge... that brief stint with escapology aside... ;) )

Talk:2411: 1/10,000th Scale World

2021-01-15T00:33:08Z

108.162.245.83:

This sounds like a cool theme for a game jam. [[User:Bwisey|Bwisey]] ([[User talk:Bwisey|talk]]) 07:30, 14 January 2021 (UTC)

The comment about airplanes being close to the speed of a bullet in the explanation wouldn't be relevant due to the scale, so they wouldn't be fast compared to the scale of the people here, and with some rough calculations, I think it would take multiple seconds to pass through the thickness of a human body, so if the people were normal properties and the plane moving at its speed being proportional to its scale (thus making its speed seem normal from the perspective of someone shrunk down and on the plane looking at the rate at which it travels compared to its own length or looking at the model surroundings rather than the giant person), it shouldn't cause significant injury. Granted, as such speeds it wouldn't be able to fly, but the same sort of concerns apply to a lot else here, like the thundercloud and the rate the atmosphere gets thinner at altitude.--[[Special:Contributions/162.158.74.207|162.158.74.207]] 07:54, 14 January 2021 (UTC)

"Also, airplane speed very similar to the speed at which a bullet is fired" - That is true for real world aircraft; it is not at all given for the 1/10000th scale world. (It depends on if time is scaled or just spatial dimensions) [[Special:Contributions/162.158.134.84|162.158.134.84]] 09:59, 14 January 2021 (UTC)

The rant about private vs public research seems a tad coat-racky. [[User:Yngvadottir|Yngvadottir]] ([[User talk:Yngvadottir|talk]]) 12:08, 14 January 2021 (UTC)
: I agree, so I removed it. There's no indication that Randall meant anything more by it than the usually fun activity of playing with balloons would be harmful if done to weather balloons. [[User:Bischoff|Bischoff]] ([[User talk:Bischoff|talk]]) 13:45, 14 January 2021 (UTC)

Do disasters in the model have consequences in the real Earth, like in the first row of xkcd #1515? Not being allowed to create megatsunamis or trigger the Yellowstone Supervolcano would support this, but being allowed to step on cities that do not have especially pointy towers would oppose it.[[Special:Contributions/162.158.186.220|162.158.186.220]] 14:07, 14 January 2021 (UTC)

This, ladies, gents, and variations thereupon, is the ''xkcd'' I know and love. [[User:Lightcaller|Lightcaller]] ([[User talk:Lightcaller|talk]]) 14:34, 14 January 2021 (UTC)

I would really like this on a poster. [[Special:Contributions/172.68.57.33|172.68.57.33]] 16:12, 14 January 2021 (UTC)
:That'd be good. In large format. (Though, if it's a 10,000:1 scale printing I see a couple of problems.) [[Special:Contributions/141.101.99.19|141.101.99.19]] 21:16, 14 January 2021 (UTC)

Wouldn't an airplane be to the people about twice the speed of a garden snail? [[User:Sarah the Pie(yes, the food)|Sarah the Pie(yes, the food)]] ([[User talk:Sarah the Pie(yes, the food)|talk]])

: I thought comparisons of scale were an oft-revisited theme for xkcd, so was disappointed not to find a category for them; though I tried to list some of them, I didn't find nearly as many of them as I thought there ought to be. Only just noticed the reference in discussion here to 1515, which kind of supports my suspicion that there are lots I didn't find. --[[User:Pi one|Pi one]] ([[User talk:Pi one|talk]]) 17:06, 14 January 2021 (UTC)

I like how the curvature of the world is drawn to scale as well. IE: imperceptibly curved. [[Special:Contributions/108.162.216.182|108.162.216.182]] 17:13, 14 January 2021 (UTC)

Probably not actually related to the comic, but the notes in the explanation about how "earth on this scale would be the size of an asteroid" made me think of the Little Prince, which Randall is known to be fond of. -MeZimm [[Special:Contributions/162.158.74.85|162.158.74.85]] 18:26, 14 January 2021 (UTC)

For comparison the Queen's Museum model of NY City is at a scale of 1:1,200. 1:10,000 maps of many areas are available, so you could lay out a county or so in your living room. Not as good as a model but still interesting.[[Special:Contributions/173.245.54.121|173.245.54.121]] 22:33, 14 January 2021 (UTC)
: As recently added to the explanation, but in case anyone missed it and yet would finds it of interest: http://www.mapascotland.org/ [[Special:Contributions/162.158.155.85|162.158.155.85]] 22:41, 14 January 2021 (UTC)

This reminds me of the planet Dwarf Terrace-9 from Rick and Morty. Possible reference? [[Special:Contributions/173.245.54.19|173.245.54.19]] 23:59, 14 January 2021 (UTC)

A fun bit of trivia I noticed is that the Kármán line (the "edge of spaaaace") would be a little below the height of a typical utility pole (10.67 m).