2023-06-06 ศัพท์ น่าสับสน ชุด K - Knot
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Dictionary.com
ออกเสียง knot = ‘NOT’
NECTEC’s Lexitron-2 Dictionary
ให้คำแปล Knot n. = ปม เงื่อนงำ ความเร็วในการเดินเรือ 6080 ฟุต/ชม.
vt. = สร้างปัญหา ผูกเงื่ิอน
adj. = ยุ่งยาก ซับซ้อน
Dictionary of Problem Words and Expression
Knot
It is an error to mention
“knots an hour” or “knots per hour.”
A knot in this sense refers to a unit of speed,
“1 nautical mile an hour.”
Consequently,
the word knot should never be followed by an hour.
A ship can travel “at 10 knots”
or “at 10 nautical mile an hour,”
but not “at 10 knots an hour.”
Nor can a ship “cover such and such a number of knots.”
It speeds (or crawls) at so many knots
and covers so many nautical miles in a day.
Abused, Confused, & Misused Words by Mary Embree
knot
cord, rope, ribbon,
or the like that is tied or folded upon itself;
= a tangle in hair; a difficulty:
= a knotty problem
Not to be confused with:
not – expressing negation, denial, or prohibition:
I will not answer your question.
Collins English Dictionary
Word History:
In nautical usage,
knot is a unit of speed, not of distance,
and has a built-in meaning of "per hour."
A ship is said to travel at ten knots (and not ten knots per hour).
Although the knot is defined as one nautical mile per hour,
the similarity in sound between knot and nautical mile
is entirely coincidental.
The unit called the knot originated in a traditional method
of measuring the speed of ships
in use at least since the 16th century.
A long rope was knotted at fixed intervals,
wound on a spool, and tied to the end
of a large wooden wedge,
called the chip log or just log.
When the log was thrown into the water,
it would remain in roughly the same place
where it splashed down.
As the ship moved away,
the rope would pay out and sailors would count
the number of knots in the rope that were paid out
over a fixed stretch of time,
usually measured with a sand hourglass.
Eventually, the calculation of speed
using this method was made easier
by knotting the rope at intervals of 47 feet and 3 inches
and using an hourglass that ran out after 30 seconds.
If one knot in the rope was paid out during this time,
the ship was said to be moving at one knot,
or one nautical mile per hour.
Because of adjustments in the standard values
of units of measurement over the years,
a 28-second interval of time is now used in calculating
a ship's speed using a rope in this way,
but the basic principle remains the same.
Merriam-Webster Dictionary
Usage Notes
Is 'Knots an Hour' Wrong?
Some say knots can only be a measure of speed. Are they right?
We'll measure distance in nautical miles
(each of which is equivalent to 1.15 statute miles or 1852 meters,
and some portion of which is used in both sea and air navigation),
and we'll measure speed using … knots?
Yes, knots.
A knot is one nautical mile per hour.
Here's the background on that:
Originally ships used log lines with literal knots in them
to measure speed. Just like the knots,
the log lines were also literal, sort of.
Line is the sailor's word for rope
(rope can get you thrown overboard),
and the log was actually a pie-shaped flat piece of wood
(from a log)
with a lead weight on the curved edge
so that it would float upright.
A line with knots about every 47 feet was attached to the "log."
The log was tossed overboard
and would stay more or less where it landed,
while the attached log line would
continue trailing out from the ship.
After 28 seconds as measured by the sandglass,
the number of knots that had passed overboard was counted
and the resulting number was the speed of the ship.
(An aside: the speed of the vessel was noted in the book
about the goings-on of the log line, aka the "logbook."
Logbook got shortened to log,
and the log itself was used to record
everything about a ship's voyage.
Log later came to apply to the full record of a flight by an aircraft,
and then to any of various kinds of records of
performance, events, or day-to-day activities.
When people started chronicling
their lives and thoughts online,
the word weblog referred to the sites they used
and the content they wrote, and was later shortened to blog.)
But back to our journey:
we're traveling nautical miles
and we're measuring our speed in knots.
Our island is fictional, and we don't actually own a boat,
but knots are real. And possibly confusing.
Our imagined vessel has an electronic device
that gives us lots of information including our speed,
so we don't need any knotted lines trailing behind us,
but when the instrument reports "12"
do you say "We're traveling 12 knots"
or "We're traveling 12 knots an hour"?
Well, nautically (and strictly) speaking,
a knot is a unit of speed equal to one nautical mile per hour,
and a vessel is described as
traveling at (or "making") a certain number of knots.
But occasionally sentences like
"We're traveling 12 knots an hour" are heard.
In such cases, the word knot
doesn't mean "nautical miles an hour."
It means simply "nautical miles."
Those in the know do not appreciate such uses,
and you might want to avoid it
with your sailor friends and frenemies.
But if you do happen to say "knots an hour" or "knots per hour"
and some seafaring (or word-watching) type
implies that it's an offense worthy of plank-walking,
you may feel free to point out that
this meaning of knot was first entered in a dictionary in 1864,
and that it was first recorded a century earlier in
the writings of two people who knew their way around a gunwale:
All of which is to say:
those who say "knots an hour" instead of "knots"
are in pretty good company
—and not just the company of landlubbers.
ความเห็น (1)
Wind speed of 10-15knots is just a nice gentle breeze.Big container/cargo ships usually travel at 15 knots (sail with the winds ;-)