What Capability Each Tool Amplifies
At the tianguis (open-air market), Doña Carmen carries sacks of tomatoes. With her bare hands, she can barely manage one. With a wheelbarrow, she moves five. What did the wheelbarrow "lend" to her body? And what does a magnifying glass lend to an embroiderer? On this page you will find out.
Tool, machine, and instrument
Human beings have bodies with limits: we have no claws, we can't see the very small or the very distant, and our strength is limited. To overcome these limits we create objects that extend the body. This is called delegating functions: a task that the hand, the eye, or the arm would do is handed over to an object.
The boundary is not always exact: the wheelbarrow is a lever with a wheel, so it is considered a simple machine. What matters is knowing which part of the body each object extends.
Which capabilities are amplified
Almost everything we invent amplifies one of these capabilities:
| Capability | What it means | Examples |
|---|---|---|
| Strength | Moving or breaking things with less effort | hammer, lever, wheelbarrow |
| Reach | Getting farther or higher | ladder, long tongs, telescope |
| Precision | Making fine, exact movements | precision tweezers, needle, scalpel |
| Speed | Doing the work in less time or covering more distance | bicycle, blender, mill |
| Senses | Perceiving what the body can't detect | magnifying glass, stethoscope, thermometer |
A tool can amplify more than one capability. The bicycle gives you speed, but it also lets you carry loads. To decide, ask yourself: what would be hardest for the body to do without it?
Every tool extends a capacity of the body. Match each one with the capacity it amplifies (strength, reach, precision, speed or a sense) and justify your choice in one…
Every tool extends a capacity of the body. Match each one with the capacity it amplifies (strength, reach, precision, speed or a sense) and justify your choice in one sentence: hammer, wheelbarrow, precision tweezers, magnifying glass, bicycle.
Instruments: they extend the senses
Our senses are limited. We can't judge a fever precisely by touch, we can't hear the heart from the outside, and we can't see the moons of Jupiter. Instruments extend the senses and also give us data that we can measure and compare.
| Instrument | What it extends | Need it meets |
|---|---|---|
| Clinical thermometer | Touch (feeling heat) with an exact number | Knowing whether there is a fever and taking care of health |
| Stethoscope | Hearing | Listening to the heart or lungs for a diagnosis |
| Scale | The perception of weight | Buying or selling by the kilo, measuring doses |
| Telescope | Sight at a distance (reach) | Learning about the sky and finding our way |
Notice that each instrument responds to a human need: health, trade, knowledge. A tool never appears "just because": it appears because someone wants to solve something.
Instruments extend the senses too. State which sense or capacity each instrument extends and which human need it meets: clinical thermometer, stethoscope, scale,…
Instruments extend the senses too. State which sense or capacity each instrument extends and which human need it meets: clinical thermometer, stethoscope, scale, telescope.
Technical change: from the hand tool to the machine
Over time, tools change so that they amplify more or meet the same need better. This is called technical change.
Example with the need to grind corn to make tortillas:
The need (eating tortillas) is the same, but how much work we delegate changes. With the metate (grinding stone), the whole body does the work. With the electric mill, electrical energy does the effort and the person only watches and feeds it.
Each change brings advantages and also consequences: the mill saves hours, but it costs money, needs electricity, and can change the flavor or the livelihood of the person who used to grind by hand.
Organizing ourselves also extends the body
Not everything that extends the body is an object. When several people organize, they achieve what one person alone could not: it is an extension of the collective body.
Think of a faena in a town, where everyone helps build a classroom; or a soccer team, where each player covers a zone. Dividing tasks increases the speed and reach of the group.
This connects to the technical system: an organized set of elements that transform something to meet a need. Its elements are the forms of organization of the people, the means (tools and machines), the materials, the energy, the knowledge, the traditional know-how, and the experiences.
Knowledge is learned in an orderly way (at school, from a manual). Traditional know-how is communal and passed down by tradition, like the way a grandmother teaches her granddaughter to perfect a stitch. Experiences are what each person or group has lived through by doing the work over and over. In the next section you will look at each element in detail.
Case: embroidery in Tenango de Doria
The artisans of an embroidery cooperative use a needle, a thimble, an embroidery hoop, and a hand magnifying glass. Let's analyze them with the method from this page: limitation of the body → what it amplifies → need it meets.
In an embroidery cooperative in Tenango de Doria, Hidalgo, the artisans use a needle, a thimble, an embroidery frame and a hand magnifier. For each tool, explain in your…
In an embroidery cooperative in Tenango de Doria, Hidalgo, the artisans use a needle, a thimble, an embroidery frame and a hand magnifier. For each tool, explain in your own words which limitation of the body it overcomes and which interest or need of the group it helps to meet.
Go back to the beginning: the wheelbarrow lends Doña Carmen strength (it is a lever with a wheel), and the magnifying glass lends the embroiderer a sense (sight). Both objects extend the body to meet a need.