The use of tools

It is a commonplace that humans are distinguished from other creatures by a technological ability, and man has often been described as a tool-using animal. The distinction is not entirely valid. Some animals do use tools. Chimpanzees are the most often quoted example, stripping a twig to plunge it into an anthill and then eating the tasty termites which cling to the end of it.

A more modern example of tool-using is that of crows living in a walnut avenue in the Japanese town of Sendai. The walnuts are too hard to crack. So the crows have taken to dropping them on a pedestrian crossing where they are crushed by the passing traffic. When it is the pedestrians’ turn, the crows fly in to bear off the fragments.

But there is a difference between using a tool which comes to hand, however improbably, and fashioning one for a purpose. Shaping a tool for cutting or scraping (two basic and useful functions) is a difficult task. Such a tool must be made of a hard material, and the hardest material easily available on the surface of the earth is . But how does one shape a without tools?

The of human begins with the discovery of how to give stone a cutting edge. The type of stone found most suitable for the purpose is flint.

Stone tools: from 2.5 million years ago

The human discovery that round nodules of flint can be split and chipped to form a sharp edge is extremely ancient. Tools made in this way have been found in Africa from about 2.5 million years ago. Gradually, over the millennia, in an extremely slow version of an industrial revolution, new and improved techniques are developed for striking off slivers of stone.

Variations in the flints found with fossil remains (differing both in the method by which flakes are chipped from the core, and in the range of shapes created) are used by anthropologists as one way of assigning human skeletal remains to specific groups or Divisions of the Stone Age.

In the earliest periods a single tool is usually made from the core of the flint, resulting in an instrument that can be used in a fairly rough manner for either cutting or scraping. Hundreds of thousands of years later, craftsmen have become skilled at forming the flakes themselves into implements of various kinds, producing specialist tools for cutting, scraping, gouging or boring, as well as sharp points for arrow and spear heads.

These sophisticated stone tools, in their turn, make it possible to carve materials such as antler or bone to create even sharper points, or more complex shapes (such as hooks or needles).

: from 500,000 years ago

An event of crucial importance in the development of technology is man’s taming of fire. This probably happens some 500,000 years ago in China, where the caves occupied by Peking man contain what appear to be hearths. Some experts believe there is evidence of the use of fire much earlier in south Africa.

It will be many millennia before fire is adapted to any purpose other than for warmth and for roasting meat and root vegetables. But more than 250,000 years ago hunters realize that the sharpened point of a wooden spear can be hardened by charring it in embers.

Neolithic technology: from 8000 BC

The technological potential of fire is not discovered until well into the neolithic period. Pottery, fired in a primitive kiln, is known from about 6500 BC. The smelting and casting of metal require considerably higher temperatures and are not attempted until much later, from about 4000 BC. The introduction of copper, and then bronze, brings to an end the neolithic period.

Other basic technologies, not requiring fire, are well established in neolithic times. Textiles feature almost as early as Pottery. Weights designed for spinning are common in neolithic sites, and fragments of fine woven cloth survive in graves at Catal Huyuk from as early as 5800 BC.

Bricks: from 8000 BC

An innovation in the neolithic period is the use of bricks. In their simplest form (still familiar today in many hot regions), bricks are shaped by pressing mud or clay into a mould. The damp blocks are then left to bake hard in the sun. Bricks of this kind are known in Jericho from about 8000 BC.

The more durable type of brick, baked in a kiln, is an offshoot of the potter’s technology. Kiln bricks are widely used in the two earliest civilizations, in Mesopotamia and Egypt, often to provide the outer surface of walls on an inner core of sun-dried brick.

Spinning: from 8000 BC

The spindle develops naturally from the process of twisting fibres into a thread by hand. The spun thread must be stored, and the easiest way is to wind it onto a stick. This means that the stick is also attached to the unfinished thread (the fibres which are still being twisted). The stick must therefore twist with the fibres.

Instead of being an encumbrance, this can be turned to advantage. If the stick is given greater weight, by attaching to it a lump of clay or a stone, its momentum will help in spinning the thread.

The thread can be turned into fabric in either of two ways. One of them links a continuous length of thread in rows of interconnected loops. This is knitting, which can create garments of any shape.

The other method, going back to at least 5800 BC, uses the thread in a rectangular criss-cross pattern to produce flat cloth. The vertical threads are stretched taut to form a grille; the horizontal threads are then interwoven between them. This is the process for all textiles of cotton, linen, silk or wool. It also produces tapestry. It makes the cloth which is decorated in embroidery. When loops are inserted, it gives the soft pile of rugs and carpets. All these involve the basic craft of weaving.

So the spindle acquires its two characteristics. It is a bobbin, on to which the spun thread is wound; and it is a flywheel, prolonging the spinning motion which creates the thread.

The spinner uses one hand to draw out the fibres from the bundle of wool, cotton or flax, thus extending the half-spun thread to which the spindle is attached. The other hand gives a rotating flick to the spindle whenever it begins to lose impetus. Hand-spinning of this sort becomes a basic cottage industry throughout the world.

Loom: from 6000 BC

Weaving of cloth requires a loom – a structure which will hold taut the vertical threads (the warp), while the weaver snakes each horizontal thread in and out to form the weft. When the threads of the weft are pressed down tight, to form a solid mesh with the warp, a section of the cloth at the bottom of the loom is complete. A pattern is achieved by varying the colour of the threads in warp and weft.

The earliest known evidence of a loom comes from Egypt in about 4400 BC, but some method of supporting the warp exists from the beginning of weaving. The threads must either be suspended (and held taut by a weight at the bottom) or else must be stretched in the rigid frame of a conventional loom.

Weaving: from 6000 BC

Until recently the earliest known scraps of cloth are woven from wool; dating from about 5800 BC, they come from Catal Huyuk in Anatolia. Similarly the first known example of linen has been from about 5000 BC in Egypt, where flax (an indigenous wild plant in the Mediterranean region) is cultivated. But a small woven fragment discovered in 1993 near the upper reaches of the Tigris probably pushes back the available evidence. It appears to be linen and has been dated to about 7000 BC.

Cotton is grown in both Eurasia and America; woven cotton survives from about 2500 BC in the Indus valley and slightly later in Peru. The most precisely localized source of any major fabric is China, where pieces of woven silk are known from about 2850 BC.

The first miners: from 4000 BC

By 4000 BC deep shafts are cut into the hillside at Rudna Glava, in the Balkans, to excavate copper ore. This robbing of the earth’s treasures is carried out with due solemnity. Fine pots, bearing produce from the daylight world, are placed in the mines as a form of recompense to propitiate the spirits of the dark interior of the earth.

By about 3800 BC copper mines are also worked in the Sinai peninsula. Crucibles found at the site reveal that smelting is carried out as part of the mining process.

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