
For a couple of minutes of paper or paperboard will be able to make strenuously device that will instantly show you the centre of any circle, for example, the base of the cylinder. The secret lies in the fact that the rays arrows, encircling a circle located at an angle of 90° to each other, and a “shaft” of the arrow divides this angle in half, and it always passes through the center.
Recommend to read
WITHOUT A COMPASS
To cut a round hole in a Board or plywood quickly and accurately will help offer a simple reception. Bar of the desired length and cut saws — all that will be required, and how to act —...
CAPACITORS REJECTS BASIC
I remember a few years ago in the journal "modelist-Konstruktor" there is the material possibility of measuring electrical capacitance using a PC "Specialist". Then published the program...