Drawing Straight Line Without Ruler
It is very difficult to draw a perfect straight line on paper without ruler. It is almost impossible to do that, no matter how careful and precise you draw, the manual hand drawn straight line will become a bit curvy and jaggy without ruler.
This problem inspires an innovative Korean inventor named Giha Woo to design a tool which can be used to draw a straight line without using a ruler.
This Woo Giha's invented tool is named "Constrained Ball", a mini-sized device consists of a wheel axle with a pencil holder hole which forms a certain angle in where a pencil or pen is inserted.
The working principle of this Constrained Ball is quite simple, it keeps the distance between the wheel and tip of a pencil or pen constant as we stroke the tip on a paper. This way we can draw a perfect parallel and straight line with a pencil or pen.
An improved version of this tool also has a small display equipped which is used to show the length of line you have drawn in realtime, for example if you have drawn a 12.8cm line, the attached display will show 12.8cm and when you continue to draw, the number will increase. This way you can track how long you have drawn. To track the length of line, this feature counts numbers of wheel rotations, like a tripmeter in a car.
This tool is a perfect companion for architect when drawing construction designs or other people who frequently draw lots of straight lines. Now you can say good bye to your ruler.
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