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In short, what is important is to know as many available materials as possible. And we must make sure how to use them and their formative possibility, be ready to use them in any case without worrying. This will be useful in an actual construction. The kinds of writing equipment have increased. However, beginning with the writing brush and brush which can freely control the width by power, we are approaching the development of precision machines which can limit the width of lines. Among these, the rotring is a very useful tool that can function both to change and limit (maintain constant quantity) the width of lines. A circle can be written most easily by a popular compass. The set of a rotring and a compass is generally called engineering drawing equipment. The ellipse compass has not been seen sold in stores recently, however, an ellipse is easily made because it can be written by several other tools or equipment. Other curves become difficult to write. It is because there is not any tools which are useful and easy to use. There are many rulers sold in stores. They can be divided into those which make right angles or straight lines, including a drafter, and those which make curved lines. To make special curves, many kinds and sizes of ellipse rulers are fine and available, as others, there are rulers to make a hyperbola or a sign curve and so on, however they can draw only limited kinds of lines. To measure length or distance, there are scales, and a divider is also a useful tool for measuring. Especially when precision is required, it can be done with the help of a slide caliper and a micro meter. As for other curve rulers, besides these tools above, there are the cloud ruler and, a changeable curve ruler, and so on.
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