In addition to the hourglass, there are more structurally similar water. Their simplified version can be made and most. Enough to take two graduated bottles for baby food and to connect them with their necks in one tube, which is inserted two thin tubes, so that their opposite ends do not reach the bottom of the bottle. Time can be tracked for graduation or to apply a special scale by looking at the clock.
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Sink can be made of ordinary plastic cans of 5 litres and curved, as shown in the figure, a metal tube. Tightness is ensured by a gasket made of thick rubber, is placed in the tube. The...
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Mogilev plant "electric Motor" produces handy and compact machine "Skillful hands". It can be cut into strips of the desired size sheet getinaks, textolite, plexiglass, plywood — any...
