The making of hooks to be used for hoisting and other purposes is important. Such a book is shown in Fig. 59. It is made with an eye for the reception of a chain and varies in size between that eye and the point. This variation is for the purpose of so distributing the metal that the hook will be the strongest at those points where it is subjected to the greatest stress. If we consider the depth of the metal to be 2¾ incites with a width of 1 7/8 inches at the point of largest section, the hook shown can well be made of iron 2¼ inches in diameter.
In choosing the metal to be used for a hook, select a bar having about the same sectional area as the largest section of the hook. This will require the least amount of drawing out. For the hook shown in Fig. 59. a length of about 101 inches will suffice. It will be better, however, to cut off at leas! l2 inches for the first one. If a number are to be made, subsequent hooks may be forged without waste. For the first it is better to use ample stock so that the work may not be spoiled. The bar should first be drawn out to the shape of the hook as in Fig. 60. As thus drawn, it will be a little longer than the inside of the hook. After drawing, weld in the eye as already directed for eyes. Then bend the hook into shape over the horn of the anvil. This bending will shorten the metal on the inner curve of the hook a very little, and lengthen it on the outer. The amount of the change in dimensions will depend upon the temperature at which the work is done. After completion the work should be carefully finished under the swage.
Where largs numbers of such hooks are to be duplicated they are stamped out under a steam hammer or a drop.