DEFINITION AND KINDS OF RULER AS A MEASURING TOOL

In this post I will discuss about the rule is as stationery that is often used to measure something or to make a straight or curved line and others.

Ruler is a measuring device and drawing tools to draw a straight line. There are various kinds of ruler, straight from the start until the triangular (usually triangles and isosceles right triangle is 30 ° -60 °). The ruler can be made of plastic, metal, ribbon-shaped and so on. There is also a ruler that can be folded.

Experts say that the ancient ruler found by the people of the Indus Valley Civilization around 1500 BC, but several others said it had already found evidence in the area of Lothal (from the time of 2400 BC). In modern times, the use of folding ruler found by Anton Ullrich in 1851.

There are various kinds of rule is the rule roll (roll bar), ruler ribbon shape and folding ruler. We will discuss the types of bar one by one.

Shaped Ruler Roll (Roll Ruler). Ruler shaped roller is a measure of the amount of length that can be rolled up, usually ruler of this kind are made of thin metal formed and in the contents of scale. This roller bar often use to measure an object that is very long (more than 5 meters). It is impossible to measure something that is more than 5 meters in length using the ruler.

Roll bar or roll bar is very practical to be taken everywhere because of their small size but able to measure something that is more than 5 meters in length. So builders often bring crossbar roller for use to measure the length of wood or high walls. Try to imagine if builders bring a ruler to measure the height of the wall.

Ruler Shape Ribbon

Besides that can be rolled up, there is also a bar-shaped ribbon. The purpose of the rule is to facilitate the ribbon-shaped measuring the diameter of an object whose size is large. Ribbon-shaped bar is often used mainly by tailor clothing, to measure the diameter of the circle of human arm and waist.

  It is impossible tailors using the ruler in the form of rollers to measure the human body because the bar is made of metal rollers that if curved too curved will cause fracture. Although the shape is different from the ribbon bar has the same rigor that is 1 mm or 0.1 cm.

Folding ruler

Besides that can be rolled and shaped ribbon, there is also a bar which can be folded. Folding ruler was discovered by Anton Ullrich in 1851. The folding ruler is used mainly by the carpenter, but now the bar as it is rare because there are more practical roller bar. Folding ruler is also made of wood that is of course faster when compared to the ruler rollers made of metal (aluminum).