Contrivances to economize labour, such as that of the needle-sorter's sheath, and the nicks in the type of the compositor, are constantly occurring in manufactures. The tags of laces, which are made of thin tin, are sometimes bent into their requisite form by the same movement of the arm that cuts them. A piece of steel, adapted to the side of the shears, gives them at once their proper shape. The writer can remember that when he was a boy, and was fitted with a pair of laced boots, he used to wait with patience in the shoemaker's shop, whilst he clumsily bent a piece of tin into the form of a tag, and then as clumsily hammered it round the lace. In a silk manufactory boot-laces are now prepared with tags made by machinery. One machine cuts and hollows the tags much more efficiently than the shears mentioned above; and at another machine, worked by a boy, the tags are fitted to the laces with a rapidity which is acquired by continued practice. [Illustration: Machine for fixing tags to laces.] If the small shot which is used by sportsmen were each cast in a mould, the price would be enormous; but by pouring the melted lead, of which the shot is made, through a sort of cullender, placed at the top of a tower, high enough for the lead to cool in its passage through the air, before it reaches the ground, the shot is formed in a spherical or round shape by the mere act of passing through the atmosphere. Some of the shots thus formed are not perfectly spherical--they are pear-shaped. If the selection of the perfect from the imperfect shots were made by the eye, or the touch, the process would be very tedious and insufficient, and the price of the article much increased. The simplest contrivance in the world divides the bad from the good. The shots are poured down an inclined plane, and, without any trouble of selection, the spherical ones run straight to the bottom, while the pear-shaped ones tumble off on one side or the other of the plane. [Illustration: Inclined plane for separating shot.]