I just got another knots book, and I must say that in alllll of the
books purporting to address the topic, there is one heck of a lot
of plain lousy reporting. It seems that the main resource for
knots-book authors is the set of prior knots books (no matter
how lame).
(I have yet to really understand how a
sheepshankwas important, but a great many books include it; I really don't
understand that need to "shorten a rope"; and the notion of
protecting a damaged spot is so darn lame :: why put it
in part of the structure where there is ANY tension, vs. at
the bight ends of it where there is NONE/zero !! But every
book that shows this use puts it where . . . other books do.)
Some decade-plus ago, I drafted a
Template for Documenting
Historical & Current Practices of Knots & Cordage Usage.
Gee, perhaps something will come of this, if it's not kept
*secret* in some file of mine (which I might not find)!
So, voici --a draft, an idea for doing things better.
(I give the drafted outline of the documentation with my
effort to apply it for some commercial fishing with which
I've some acquaintance (alas, not so easily of late). )
- - - - - - - - - - - - - - - - -
TEMPLATE FOR DOCUMENTING THE HISTORY AND CURRENT PRACTICES
OF KNOTS & CORDAGE USAGE.
[2004-02-24, tweaked a bit 2017-12]
Example (commericial fishing(longline(whelk/conch)
& (longline(crab))
& (longline(lobster))
summary overview of the cordage use / application
--general description of application
--scope of observations (what is the basis for information?!!)
--cordage structures
__material(s)
__knot(s)
o- tying needs (speed, security, re-use/untiability)
o- forces
o- conditions (weather/UV/material disturbances)
--skills learned how? (hearsay, hand-me-down training)
--regulatory requirements (e.g. groundline issue re whales)
The commercial whelk fisher uses traps (pots). These traps are
set in waters <depth, current> either singly or in sets (defined
to be traps that are connected to the same line for retrieval).
Rope is used to retrieve the trap; either a single line is tied
to the trap and a buoy, or either of the surface & submerged
entities is tied to a long retrieval line with connecting lines
(gangions). E.g., often the case is that a line is attached to
a buoy and then tied to a bridle rope which in turn is tied to
the trap. In the case of sets of traps, a longline will be used
and connecting lines (gangions) will usually join the pot bridles
to the longline/groundline.
Additionally, the whelk traps themselves contain some rigging:
plastic-coated wire or vinyl mesh is used in conjunction with
a slice from a plastic drum; the mesh forms the bottom and part
of the open top. Heavy nylon monofilament line is generally used
to secure the mesh to the drum slice, reeved through holes punched
in the latter, and tied off with a form of trucker's hitch and
half hitches. Similar (sometimes heavier!) line is used to make
an impediment for whelk escape, tied around the open rim of the
drum with about a 1.5" gap; this line is reeved through small
plastic tubes which keep it away from the drum rim at points of
attachment. (The whelks climb up the drum and fall into the
trap in search of the bait, but cannot crawl out because of this
line (sometimes strips of wire mesh) impediment.)
-----------------------------X(30)---------------X(50)---------------X
Whelk pots sometimes have weights inside, such as cement poured
around the bottom rim of the pot, which might also help secure
the bottom mesh. Bait of horseshoe crab (an environmental issue)
or other fish is secured by bungee cords to the bottom mesh, or
by other means. Pots can be manufactured commerially, but often
are hand-made, sometimes by the fisherman, using slices of large
(40-60gal.) plastic drums; sometimes the pot is altered from the
natural roundness of the drum slice into a more retangular shape.
A round conch-pot bridle typically comprises two short lines,
one about twice the length of the shorter one; the longer line
forms two of the three legs and the eye for attachment for the
gangion, and the shorter forms the third leg, and is tied into
the eye. Some pots have a bridle at one end instead of around
the upper rim, and in this case a single line is used, like the
longer of the two lines. The bridle is secured to the drum sides
with Overhand, Dble.Overhand, Fig.8 stoppers (the line being
inserted through a made for this), or by a Clove Hitch finished
with a Half-Hitch and hog rings (metal rings "stapled" around
the rope & standing part). In the case of the third leg line,
it is tied directly to the loopknot's eye with a clove hitch etc.,
or the end is stoppered and put between the eye's legs, narrowed
by a hog ring, or the end might be reeved through the lay (for
laid rope) other two legs near the loopknot, and then tucked
back through itself and stapled.
Example (longline(lobster))
(rope type, knots used, expected duration of knot,
whether it's to be untied, how the knot's tied)
summary overview of the cordage use / application
--general description of application
"Trawls" (long groundline-connected sets of traps) are laid in bay and ocean
waters ranging from <> to <> fathoms. A trawl can be a mile long; it comprises
usually two buoys (a "highriser" metal-winged buoy detectable by radar, and a
dayglo large plastic ball float), and an end line from them down to an anchor
weight, a groundline from that anchor point running the length of the trawl,
with gangions tied to the groundline and to the bridles of each trap (or "pot").
A long groundline can be composed of several lines--e.g. 4-5 1,800' spools--,
each from 5/8" to 3/4" dia. and of a (usually medium or soft) laid construction
polypropylene, co-polymer, or poly-Dac. The endline might be simply part of the
groundline running from the nearest pot to the surface buoys, or it might be a
distinct line, chosen for particular qualities. The gangions are from 5/16" to
7/16" dia. of similar construction & material. The bridles are similar to the
gangions (in general, but not necessarily per trawl).
Thus, knots are employed: to join groundline segments to form a longer line;
to secure lines to buoys and pots, and these in turn to gangions, and them to
the endline or groundline.
--CORDAGE STRUCTURES
__MATERIAL(S)
7/16"-5/8" laid PP, CoExtruded Olefins groundline;
5/16"-7/16" laid PP, Polycombo, CoEx gangion & bridles;
60-100# nylon monofilament;
small braided cord;
shock cord;
__KNOT(S)
Fisherman's Knot;
Clove Hitch & HH, end secured;
Overhand eyeknot;
Single & Dbl. Becket Hitch, end secured;
Truckers Hitch;
Half-hitches;
Overhand Stopper;
Rolling Hitch & variants.
o- TYING NEEDS (SPEED, SECURITY, RE-USE/UNTIABILITY)
I believe that there is seldom a need for speed in some real-time situation.
Otherwise, tying efficiency is a general desideratum in reducing production
and maintenance work. The knots in use are quickly tied. There is some
indication that the becket hitches of gangions might be untied rather than
cut away. Many knots have their ends stapled with hog rings, and sometimes
the ends are tucked into the lay of the rope's SPart or into the groundline
(for a gangion hitch to it). Old bridles are just chopped (and this might
often include the gangion's becket hitch).
o- FORCES
Lobster pots are made of wooden slats or plastic-coated wire mesh, and weighted
with bricks or other material; they can weigh 30# going out, and of course more
with lobsters. The groundline is hauled in by a mechanical hauler, and this in
conjunction with boat movement can haul pots into rocks with considerable force
on the pot, and a risk of abrasion & strain on the lines.
o- CONDITIONS (WEATHER/UV/MATERIAL DISTURBANCES)
Lobster pots set at sea are unlikely to have significant forces from the
current upon them, but storms can wreck a trawl--a storm can entangle several
trawls set nearby, even rendering them irretrievable. (Here it's a question
of to what the endline attaches at the ocean floor--a pot, or an anchor!?)
--SKILLS LEARNED HOW? (HEARSAY, HAND-ME-DOWN TRAINING, LITERATURE)
Most skills are likely acquired through experience as an apprentice and then a
full operator. (Beachcombed remnant materials suggest that a range of knots
is used, and in some cases the user isn't so well skilled in knotting. I don't
know of any unifying store of tackling knowledge.)
--REGULATORY REQUIREMENTS
(E.G., GROUNDLINE ISSUE RE RIGHT WHALES IN MASS.USA)
In some parts of the USA --i.p., Cape Cod Bay, Massachusetts-- there are gear
requirements for the sake of protecting wildlife. The right whale is vulnerable
to snagging floating groundlines when feeding, and so there have been require-
ments for special "weak links" that should break under such whale impact,
and groundlines that are "neutrally boyant" and that settle to the sea floor.
--INFORMATION SOURCE(S)
(USER ACCOUNT, HARD LITERATURE, E-LITERATURE, OBSERVATION)
I've used mostly on-line literature and observation,
with some personal contact with a lobsterman.
On-line sources include
[Hmmmm, all but the last are NA in 2017]:
www.crewdog.net/lobsterpage/misc/credits.htmlwww.crewdog.net/lobsterpage/lbstrng/gear.htmlhome.tallships.ca/dPTranslations/dPlobsterpotsPh.html
www.mass.gov/marinefisheries===========================================================================