Bends and Bending:
There is much reading to be had on hooks and different shapes of hooks in books, catalogs etc. At the end of this article the reader will find reference to some of the most interesting sources. Today as well as in the old days there is a wide variety of different designs available and as it will be possible to explain just a little bit about the subject here I will stick to one design only: the Limerick style of bend.
In my opinion THE classic salmon fly hook is per definition the Limerick hook. Take a look at the hook plates/photos in Taverners book. Tell me of someone who can explain exactly what a Limerick hook looks like and I'll give him 100 bucks without blinking! YES - it is a good question! Figure 1. shows two hooks - a traditional antique Limerick together with the modern Limerick we know today.
The only certain thing we can say about the name Limerick is that it's a town in Ireland! Limerick is also the term or name for a particular hook type or bend design, not a particular maker or product. In short and rough terms the Limerick hook style is characterized by a bend that follows an almost exponential curve from where the bend starts at some point behind the barb to where it becomes the straight shank. Most modern limerick hooks have a straight spear from the point all the way back to the back of the hook - where the bend starts to curve upwards. In classic Limericks the bend from the shank side becomes a circular bend which again curves the point upwards and in towards the shank. The transition from bend into shank could be very long (so-called hog backs). Contrary to what most people think, the weakest point of the hook is just at the point where the curve of the bend enters the shank. The hog back type Limericks were extremely strong because the transition between the curve of the bend and the shank is almost non-existing, thus distributing the pressure over as large a surface as possible. That is why the modern Bartleet type hooks are actually much stronger than the thin, light wire immediately leads you to believe.
The bending of the hook is in principle quite easy. In the old days the hook makers or needle factories used to send out the pointed and filed pins to families in town, where the kids would then sit and bend the pins into shaped and half finished hooks. To be able to do the same job you actually only need a pair of pliers. Pliers have a great disadvantage though, you can not bend the wire with pliers without leaving the bend full of nicks and marks. Often you can see angles in a bend that should be curving and that looks bad.
The tool that was used back then was a simple preshaped piece of flat steel or iron plate set into a wooden block together with a small pin to direct the position of the barb and hold the wire while bending. In modern hook making this tool - the template - consists of a steel block cut to shape that may bend from 1 to as much as 100 hooks at a time.
I use such a template cut and filed into shape out of a block of aluminium bar stock (see Fig. 4). The advantage of using this method compared to bending a flat piece of steel into shape and trying to center it in a wooden block is obvious. Using an aluminium block gives you the advantage of being able to file on and on until you reach the right shape. Often you need to over bend the wire to get the exact hook shape - depending on the hardness of the wire you use; this is the only trouble you will encounter, but nevertheless it can be quite time consuming. No advice can be offered because we will never use the same steel - so just keep filing! Eventually you will learn that the "overbend" will be most apparent from the last part of the bend through to the shank. Oh, just one little piece of advice: If you move to a new wire stock or different maker, the softness of the wire will be different - and so, you'll have start all over again with filing templates!
The template is fastened to a wooden or iron block together with a small steering pin to direct and hold the point while bending. This pin must be placed in an exact and fixed position under the point. Lots of experience have taught me that the position of the steering pin is THE critical factor that will in the end determine the final shape of the hook and the direction of the point.As soon as you have a rough template that you want to continue with you should there-fore fasten it in a fixed position on the block with the pin fixed in position as well. If you don't do this you will eventually end up filing in a whole lot of different places on the template, never really getting the right result simply because you move the pin around. If you are smart, you fix the pin on a rotating screw so that you can move it a few millimeters back and forth as well as up and down, by doing so you get the opportunity to be able to create different hook shapes on the same template! Finally remember that you may adjust the bend of the finished hook with a pair of pliers, but be careful and use the kind that has nylon jaws that don't make marks!
Essentially now the hook is finished and needs only to receive it's final strength through hardening and tempering followed by a coat of finish. Before applying heat to the hook it's a good idea to degrease in some form because any grease on the steel will burn and leave black shells on the surface that can be time consuming to remove.
Before divulging into the science of hardening you should know that unless you need strong fishable hooks it doesn't really matter much with critical temperatures. The hardening process itself means heating the steel until reaching its critical temperature followed by rapid cooling. The critical temperature is dependent on the composition and the carbon content of the steel. It can be found in two ways. One is by holding a small magnet to the steel while heating. As soon as the hook reaches a point where there is no magnetic adherence or attraction the critical temperature has been reached. This is the rather inconvenient approach. The second way is to know the hardening color of your type of steel and then judge the heating and temperature by the color changes of the hook. Most temper-able carbon steels will harden somewhere around 800 - 1000 degrees Celsius corresponding to the colors blood red to medium orange. Upon reaching the desired temperature or color, quickly submerge the hook into ice water or cooled oil. It should be of little importance what cooling agent you use, but I advice you to use oil since I have seen some problems with tempering after cooling in water. Oil has the advantage that it will penetrate the steel to some degree and therefore protect the hook later. In general ice water produces the most hard as well as most brittle hardening. Oils produce softer hardenings.
Having heated the hook to extreme temperature and maybe submerged it in oil or water you need to perform a final degreasing before you venture into lacquering or japanning the hook. First remove the coal shell from the hook by a light polish with fine soft sanding paper or steel wool - I prefer steel wool, because it gets into the corners, but it tends to stick to your fingers and create a one week itch all over your hands! I keep returning to the smart stuff, so here's another: Make yourself a small barrel 10 x 5 inches and join it to a small toy engine for rotation. Fill it half up with fine sand and rotate the hooks in it for half a day - they come out as polished silverware! Then remove the last grease by use of acid. I use concentrated phosphoric acid which is a very powerful acid, so mind you it works just as fine on exposed skin as it does on steel! The acid removes grease and at the same time it created a rough surface (not visible to the human eye) that helps bind the paint that will be applied later. Acid treatment time varies with concentration of acid and thickness of wire but by using the concentrated acid I seldom treat large hooks for more than 20 minutes, the process is easy to follow. From now on DO NOT TOUCH the hook with anything like greasy fingers!!
Following hardening and acid treatment the hook is brittle and will break if bent or dropped on a hard floor. To achieve the right softness or strength the hook has to be tempered. This is usually (again depending on the type of steel etc.) achieved by heating to approximately 250-280 degrees Celsius which can be done in a normal household oven. I temper at 250 degrees followed by a slow cool-down. During tempering the hook should achieve a bluish to brown-yellow color - this was the final color of older antique hooks that were not japanned.
The paint, lacquer or black Japanning protects the hook from rust and produces a desired finish. Japanning is a term used for applying a special black lacquer to metal or hooks (or other items). Today no hook factory uses the same method and we can not expect them to reveal their secrets.To achieve the point of having a perfect finish for hooks is somewhat of a challenge and it is still one of the details upon which I have not been able to produce a fully satisfactory result.
The method of black Japanning originated from Japan. Originally the black lacquered surfaces were produced with the raw sap from the trunk of the lacquer tree of Manchuria. This semi-milky sap has a colorless, transparent and almost opaque color that is easily blended with a fine powder to produce a colored substance. This lacquer produces extremely beautiful and long lasting surfaces achieved through numerous coats only. It has many disadvantages (but as the Japanese Zen artists were born sufferers, no problem was too big to overcome), first it was EXTREMELY hazardous to your health and second: it took weeks if not months to dry. If this lacquer was needed for cane rods I can assure you that Garrison and Payne wouldn't have been in business, ever! The drying process - in between each coat - took place in the only dust free environment known to nature: at sea! The artist or craftsmen bore their products on board fishing vessels which were bound for weeks of fishing far from land, while they worked as deck hands. A properly lacquered box without chips in the surface can sell for as much as several hundred thousand dollars today.
Later, in the 19th. century, copies of this lacquer became popular and was used for black Japanning of all kinds of stuff from motor engines to fly boxes and hooks. All these lacquers or varnishes were complicated natural mixtures on a turpentine base; un-reproducible today unless you come across the archives of a 19th. century paint or varnish factory! A friendly call to Partidge of Redditch production manager Terry Emms revealed that the old recipe for black Japanning had long since been lost and that today's modern hooks are black "Japanned" with common black stoving enamels.
The hard part in painting hooks is getting the paint - let's call it varnish from now on! - to stay on the steel. NO varnish (except epoxy) will do so on a smooth or polished surface. That's where the phosphoric acid treatment comes in. So far I have come up with a handful of varnishes (actually paint!) that produces good results. There is no point in mentioning the names here because they are not available in the US. However they are all spray can paints that are heat resistant up to around 500 degrees Celsius. Because of the heat resistance you can then harden the coat by re-tempering the hook. Be shure to do this at a lower temperature than the one you used for tempering. A US suggestion regarding a good coat is to use the brand Rustoleum which was recommended to me by Mark Kirchner, I have no experience with it myself as it can not be bought in Europe, but judging from Marks hooks it looks and feels good.
That concludes my story on hook making. I can only recommend any salmon fly tyer to try it out, it is not as difficult as it sounds! As long as you use a rational approach you may eventually solve any little problem that comes along, else revert to conferring with any of the growing number of fly tyers who is into this as deep as you are.
Finally here is a list of books or catalogs with plates of different hooks and styles.
Taverner, E.: "Salmon Fishing", (1932).
Ephemera: "Book of the Salmon", (1850).
Francis, F.: " Book on Angling", (1867).
Francis, F.:" Book on Angling", (1920, revised, new intro. by Maxwell, new hook plate).
Maxwel, Sir H. :"Salmon and Sea Trout",
(1898). Kelson, G. M.: "The Salmon Fly",
(1895). Sandeman, F.: "By Hook and by Crook", (1893).
Brown, J.: "Angling in North America", var. (4th. edition, 1860's is much enlarged).
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