Tackle (mechanics)

“ A gyn tackle consists of one triple and one double block: the fall is fixed to the double, then rove through first sheave of triple, then through first sheave of double, then through second sheave of triple, then through second sheave of double, and lastly through third sheave of triple block.
Power = 1⁄5 weight (5 to 1) : or Power = 1⁄6 weight (6 to 1) . Vide Fig. 7.
If the moveable block of a tackle be strapped with a tail, it is called a tail, or jigger block: and the tackle a tail, or jigger tackle: a block with a hook strapped to it, and attached to a selvage, answers the same purpose. ”

“ Hook the upper blocks of the guy-tackles to a bowline in the end of the guys, and the single block to the guy-strap, and mouse them all.
[102]
Ordinarily the fore guy can be worked without a tackle, belaying it over the holdfasts, first taking a round turn over the one next the shears. If not too heavy, the shears may be raised by lifting the head and hauling on the guy-tackles, slacking the heel-lashings as required, and tending the fore guy carefully to prevent the shears falling over toward the rear. ”

“ Take a couple of frapping turns between each pair of spars in succession and finish with a clove hitch on the central spar above the lashing. Pass a sling over the lashing and the tripod is ready for raising. [45]
TACKLE SETS
Fig. 95.
The use of block and tackle affords at least two advantages to the user. One is the advantage of position. The user may stand on the ground and pull downward—the most easy and natural way of exerting force, while the resulting forces may be developed upward as in the case of a hoist. The other advantage is mechanical. ”

“ A tackle wherein both the blocks are moveable, and communicate with a runner, is represented by fig. 10. plate VIII. That part of the tackle which is fixed to one of the blocks, &c. is called the standing part; all the rest are called running parts; and that whereon the men pull when employing the tackle, is called the fall. The application of the tackle to mechanical purposes is termed hoisting or bowssing. See those articles.
Ground Tackle. See Ground Tackle.
Tack-tackle, a small tackle used occasionally to pull down the tack of the principal sails of a ship to their respective stations. ”

“ The purpose of the tackle is to increase one’s power and the more sheaves there are and the more times the rope is passed through the blocks the more the power obtained; but as in every case where power is increased, speed is lost and to hoist a sail with a tackle with several sheaves requires more time than to do the same work with a single-sheave block. ”

“ Double Burton (D) , using but one rope, illustrates the possiblity of using it to greater mechanical advantage than would be possible in a six fold purchase. However, in this case the hoisting range is less than would be possible in a six fold purchase.
Fig. 111. Luff on Luff illustrates a common application of tackle to secure mechanical advantage. It will readily be recognized that the major tackle must be four times as strong as the other set if both are to be used anywhere near to capacity. ”

“ The tackle should always be how enough, however, to pin the legs of the runner together, thereby bringing him to earth. The resistance of the runner as he falls will protect the tackler from any possible injury from striking the ground, as the runner will act as a buffer. ”

“ And with that I caught at the tackle and gave a tug on the ropes to test them, and as they held I swung to them to slide down—and the moment that my full weight was on them they snapped like punk, and down I went feet foremost and struck on the tiers of boxes with a bang. As I fell only a little way, and upon a level surface—for I went clear of the box to which the tackle was made fast—no harm came to me; but under my feet I felt the rotten wood going squashily, and then beneath it something firm and hard. ”

“ A runner tackle is the same as a luff tackle, applied to the end of a large rope, called a runner, which is rove through a single block attached to a fixed point, or to a body that is to be moved, or raised ”

“ In order to obtain a-self-sustaining pulley tackle, which will have an efficiency of more than 50 %, various arrangements are adopted, which during lifting automatically throw out of action a brake and cause it to come into action again when the effort is removed. ”

“ Thus if any weighty body is to be hoisted into a ship, and it be found that the blocks of the tackle meet before the object can reach the top of the side, it will be necessary to lower it again, or hang it by some other method, till the runner of the tackle is sheep-shanked, by which the blocks will again be separated to a competent distance. ”

“ When you put your tackle together you will make it far 147safer if you consider it as one apparatus or machine from hook to reel and if you let the rod top, or “tip,” be the weakest point of all, because by it you can best determine the strain upon the whole gear. ”

“ Block tackle is used to raise or lower the cradle, and horizontal movement also is obtained by light guy lines working over pulleys at the jibs and secured to the tops of the suspension ropes. All adjustments can be made from the cradle with perfect safety. ”

“ It is the business of these men to stop the runs around the ends, of course, but now that the development of the game has brought in so many rushes through the line, between tackle and end, or tackle and guard, the four end men must play into one another's hands in the tackling of opponents and in the blocking of holes that the men opposite are trying to make. ”

“ The tackle is lowered, and as the spar drives against one of the stout iron legs of the light-house one of the two men catches the rope, and is quickly hauled up to the gallery. At once the tackle is lowered again, and the other man is hauled up. Half blind, half drowned, staggering with exhaustion, they are taken into the house where warm drinks and dry clothing revive them. ”

“ The lift tackle is made by getting under the runner, or at least within reaching distance, pinning his knees together, and pulling his feet from under him, or, better, lifting him up and throwing him backwards. ”

“ It only means that the men at the windlass heave on the second tackle and let the fall of the first slip round the windlass barrel. Then as soon as the second tackle has taken the strain “Vast heaving” is called, while the captain with his boarding-knife cuts through the blanket piece high above the hole he made for the securing of the second tackle and the mass, now disengaged, is lowered into the blubber room. ”

“ The tackle should be an expert in the use of the stiff arm, so that he can keep the opposing tackle and end away from him and go through the line. The opposing end is the most dangerous man the tackle has before him, and this man should be carefully watched. The tackle must not in any circumstances permit himself to be boxed, and should nearly always break through the opposing line on the outside of his opponent. ”

“ The rope of the tackle tightened against the blade and was cut, and an eddy rolled over the globe in a grotesquely helpless fashion. Some one waved a handkerchief, some one else tried an ineffectual cheer, a middy was counting slowly: “Eight, nine, ten!” Another roll, then with a jerk and a splash the thing righted itself. ”

“ One mad sheer and plunge, one terrible strain on the tackles as we sunk in the trough of the waves, tugged upon by the towing breaker, and our knives severed the tackle ropes—we hazarded not unhooking the blocks—our oars were out, and the good boat headed round, with prow to leeward. ”

“ By means of the tackle he easily pulls himself up or lets himself down as high or as low as he likes; the ring above turns round the steeple with the tackle and hanging-seat in whichever direction he desires. ”

“ There are supposed to be two ways to tackle, but the coach who was conducting the operations to-day undoubtedly believed in the existence of at least thrice that number; for each candidate for Varsity honors tackled the dummy in a totally different style. The lift tackle is performed by seizing the opponent around the legs below the hips, bringing his knees together so that further locomotion is an impossibility to him, and lifting him upward off the ground and depositing him as far backward toward his own goal as circumstances and ability will permit. ”

“ In defending his territory against trick plays, the best and only advice that can be given to a tackle is to keep the eyes open, notice the alignments of the opposing back's, the way they stand, their facial expression, and movement, and try to divine which way the ball is going. When the opposing side is going to kick, the tackle should spread a little so as to give himself a better chance of getting through. ”

“ Although, however, it may be necessary to catch up wheel-horses, and make them hold back their coach down hill, there is nothing in which a light finger is more essential to safety. The manner in which some persons haul at horses’ mouths, when descending with a load, considerably adds to the difficulty, by trying the strength of the tackle. But this is not all: these persons should be aware that all this force employed on their horses’ mouths is so much added to the pressure of the coach; in proportion to it is that pressure increased. ”

“ Look over and test your tackle every time you are going fishing—yes, and every time it gets caught on a stone or stump or in the bushes—if you wish to escape the loss of your best fish. All this means that tackle to be safe must be sound—that is, good all through. A line, for instance, which is strong in one place and weak in another will give you more trouble than one which is not so strong but uniform.
The strain upon the tackle is equalized by the elasticity of the rod, which to some extent makes up for want of dexterity. ”

“ To do all that is required of him, a tackle must have the speed of an end and the aggressiveness and all-round ability of a good back. It is needless to say that he must have courage, weight, strength and wonderful endurance to fulfil the requirements of his position. ”

“ An effective tackle, shown in one of the illustrations which accompany this chapter, is one made from behind. This is frequently possible when a forward has broken through the line just behind the path of the play. It is also employed in the open field when a runner has passed the first line of defense and is going down the field. ”

“ If he would only hit them, or skin them by inches, or shoot at them, they wouldn’t mind it so much; but when you get on the field with him and realize that if you miss a tackle he is going to get you out before the whole gang and tell you what a great mistake the Creator made when He put joints in your arms instead of letting them stick out stiff as they do any other signpost, you’re not going to miss that tackle, that’s all. ”

“ The tackle should go nearly straight, so as to protect the centre of the field, the ends taking care of the sides.
The great bulk of the tackle's work is on the defensive. His duty is to tackle everything in sight. Clean, sharp breaking through is imperative in a tackle. The first thing a tackle should do when he steps into the line on the defence, is to notice his opponent's style of blocking, and adapt his method of breaking through accordingly.
Plays directed on the tackle call for great judgment and great strength. The tackle should, if possible, shove his man back and into the play. ”

“ Steady!: An order after the helm has been put to port or starboard, to put it no farther in either direction, but bring it back amidships. When the wind is fair, an order given to a steersman to "Steady!" is to keep the helm as it is.
Tack: The lower weather corner of a sail.
To tack: To go about from one tack to the other.
Tackle: A purchase composed of blocks and a rope, for multiplying power.
Tail block: A tackle consisting of two blocks, to one of which is attached a length of rope for fastening to any object at pleasure. ”

“ When the tackle above described has been practised until it is thoroughly understood, it would seem that, once the grip is secured, it is irresistible. Yet there is an easy form of counter-movement. The one who is attacked has only to seize his assailant by the throat and press back the latter's head. ”

“ The tack, instead of being carried forward, is brought down to the mast, where it is hooked on to an iron hook if the sail be a small one, and if the sail be a large one it is fitted with a tackle, so that the tack can be bowsed down after the sail is hoisted. ”

“ Thus we see the same work is performed in the same time, whether the tackle be used or not: but the convenience is, that if the whole ten weights be joined into one, they may be raised with the tackle, though it would be impossible to move them by the unassisted strength of one man; or suppose, instead of ten weights, a man draws ten buckets of water from the hold of a ship in ten minutes, and that the ship being leaky, admits an equal quantity in the same time. ”

“ A very important part of the tackle's work is on the defense, where he should exemplify everything that his name implies. He should tackle all the time and all over the field. He should break through and tackle behind the line, and should never be denied. ”