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A rule is a tool It is manufactured with a solid material and allows measurements and the creation of straight lines. Graduate , for its part, is that or that which has a degree (a value or status).

The ruler , therefore, is the instrument that has a Value scale To know the length of something. Typically, this rule is divided into inches or centimeters , with each segment marked on its surface: in this way, by posing the graduated rule on something, we can know how much it measures by just observing the scale .

Graduated rules also allow you to draw straight lines of a specific length, since it is possible to start and finish the stroke at the exact place that marks the scale. Beyond graduation, these rules also allow, of course, to create straight lines without paying attention to the measurement .

The most popular graduate rule is the one that measures 30 centimeters . In the scale, in addition to centimeters, millimeters and decimeters may be mentioned, two units which are useful in certain contexts.

Suppose that, in a school, the teacher asks students to draw a square whose sides measure 5 centimeters . To complete this task, students must use a graduated rule that allows them to draw sides with that task. length .

A graduated rule will also be useful for a carpenter who must build a table with a table of 100 x 100 centimeters . Taking a larger piece of wood, you can mark the desired measurements with the graduated ruler and then proceed to cut the table .

Another area in which the graduated rule is usually used is DIY. When making any product from materials such as paper or wood, for example, it is normal to buy square pieces of larger dimensions than necessary, and then draw the molds on them and cut them. Thanks to the use of a ruler it is possible to respect instructions that specifically indicate the height and width of each part, or to achieve proportions desired when working without a guide.

The graduated ruler, as well as many other instruments we use today, has a very old history, and some of the first copies were manufactured with admirable precision. The first material that was used for its construction was ivory, and later it was passed to wood; however, a wide variety of materials are currently being used, including glass, plastic and steel, depending on the task to which it is to be applied and the precision desired.

Let's look at some of the most common types of graduated rule:

* desktop rule : It is the most common class and is used for measurement, to draw straight lines and as a reference to perform cuts . It is usually built in wood or plastic and measures between 20 centimeters and 1 meter, with graduation in millimeters (sometimes also includes half millimeters);

* folding meter : although its name does not indicate it, this is also a graduated rule, with the particularity of taking better advantage of the space, thanks to being divided into several segments that are easily articulated. The first to be known dates from 1851, in the hands of its inventor, Anton Ullrich. It is made of metal or nylon, among others materials . It is important to note that it stands out for not being very precise;

* measuring tape : This type of graduated ruler can be rolled, but it also allows the measurement of curved surfaces, given its flexibility. It is manufactured in plastic, rubber or stainless steel, and its extension It is usually between 1 and 2 meters. Within this group is the sewing tape .

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