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.
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In Russia from time immemorial the master sharpened wooden utensils. If it was not supposed to paint her, then cut across the grain of the wood. The product was more beautiful than...
THE NAIL WILL NOT BEND
To score a long thin nail, and especially copper or brass (e.g., with mounting frames) is always a problem. Will help you in this case, the conventional pliers or a wooden clothespin.
