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.
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, highenough 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.
Inclined plane for separating shot.
In speaking of such contrivances we are constantly passing over the narrow line which separates them from what we popularly term machinery. Let us take an example of the readiness with which a small aid to manual labour gradually becomes perfected into a machine, requiring little impulse from human action. The dippers of candles have gradually, in small establishments, made several improvements in their art for the purpose of diminishing labour. They used to hold the rods between their fingers, dipping three at a time; they next connected six or eight rods together by a piece of wood at each end, having holes to receive the rods; and they now suspend the rods so arranged upon a sort of balance, rising and falling with a pulley and a weight, so as to relieve the arms of the workman almost entirely, while the work is done more quickly and with more precision. But in large candle-factories the principle is carried much further. The wicks, having been cut by machinery of the requisite length, instead of being cut one at a time, are arranged upon a rod. For the sort of candle called "twelves," or twelve to a pound, twenty-four wicks are suspended on one of these rods. Thirty rods are connected together in a frame, which thus holds seven hundred and twenty wicks. Attached to the machine are thirty-six of these frames. The whole number of wicks is therefore twenty-five thousand nine hundred and twenty. The machine, as it revolves, dips one frame into a vessel of melted tallow; and so on till the thirty-six frames have each been once dipped,—and the process is continued till the candles are fully formed. One man and a boy complete this number of candles in a working-day of ten hours.