If the drilling hole in the concrete wall towards the drill catches a very durable stone, it is even a great tool with a well-sharpened carbide-tipped is powerless: the drill leads to the side or it quickly “sit.” In this case, the rescue steel construction dowel the proper length to: break the rock and drill further.
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PATROL BOAT
This model is designed for pupils of 4-5 classes involved in a circle of the second year. At the regional competitions 1974 Sergei Lebedev, speaking with a model with the same contours...
FLASHLIGHT FROM CLOTHESPINS
A makeshift flashlight can be made from clothespins, two drawing pins, disc batteries and a bright led. Disk battery should be installed between the findings of the led, observing...
