A roll of soft rags or foam rubber, emery paper wrapped, simple and perfectly working device for sanding curved surfaces, whether wood or metal. And the same skin in combination with two plates in it, fortified at a right angle to each other, help out in cases when you need to sand the surface of the angle or corner joint of a part or product.
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Procurability plastic ball out of the game, because it irrevocably loses its original elasticity. However, the material from which it is made, is good, and it is a pity to throw away....
PROTOTYPE -HOURGLASS
The Romanian magazine "Technium" offers a diagram of the electronic timer operates on the principle of the 5-minute hourglass clock every minute. The indication to carry out the LEDs....
