Page:The New International Encyclopædia 1st ed. v. 18.djvu/917

* TACKING. 803 TACKLE. tacking requires little labor, but in square- rigged slups the yards must be swung and the sails adjusted on the new tack. Wearing is called gybing when the vessel is fore-and-aft rigged and carries a boom mainsail which is not taken in or lowered during the operation. It containing one or more sheaves or pulleys and a strap to attach the block to the weight or sup- port. It is evident that in all cases one block of a tackle, or one end of the rope — if there is a 1' 'Pasition; Before wearing-; Vessel on porttack^ 2"-'' Position; After wearing; Vessel on starboard tack. is evident that when the wind, in wearing, passes from one side to the other of such a sail it will give a thrust of considerable violence, and this thrust must be caiefully watched in small ves- sels — and in large ones if the wind is strong — or it may cause tliem to capsize. Tacking is frequently called going ahout. While the operation is in progress a vessel is in ■stays; if she fails to tack and falls back on the same tack as before, she is said to miss stays. A lively, fast-moving vessel, particularly if deep- ly loaded, will, before losing way, shoot some distance directly up into the wind after it is out of her sails. Advantage is frequently taken of this fact to avoid some slight obstruction, when tacking is undesirable or otlierwise unnecessary, and the operation is called making a half hoard. To make a good hoard is to lose nothing to lee- ward; to make short I>oards is to tack fre- quently; to make sternhoard is to go astern. TACKING OF MORTGAGES. The act, per- mitted by a doctrine in English equity practice, of one who takes a mortgage or lien on real property subsequent to a second or later mort- gage and in ignorance of its existence, to pur- ■chase the first mortgage and merges or 'tacks' his ■security in it. The eftect of this is to compel the intermediate incumbrancers to redeem the first mortgage, including the one thus merged with it, before they can enforce their liens. This doctrine has been repudiated in most of the United States. TACKLE (MDutch, Dutch, LG. takel; pos- sibly connected with Goth, taujan, to do, or with Goth, tckan. Icel. taka, AS. tacan, to take, Lat. tangere. to touch ). A combination of blocks and ropes designed to increase the capacity of the available power to move heavy weights or de- crease the time required to move an object with a power capable of moving only at a certain speed. The block consists of a shell or frame Vol xvm.— 52. ABC D Fia. 1. A, SLDgle whip ; B, ruuuer; C and D. gun-tackles. ABC D Flu. 2. A and B, luff or watch tackle ; C and D, two-fold pur- chases. single movable l)Ioek — must be fixed. This being the case, in simple purchases and neglecting fric- W tion we have P = ^, in which P is the power, C D Fio. .•) A, Rinffle Spanish burton ; R. double Spanish burton ; C. Bell's purchase; I), luff upon lull.