What if you need to draw a circle, and a compass at hand is not! To get out of this situation by making a simple compass of the bent and strapped to the pencil in the right place for a stylus pen, as shown in the figure.
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An incubator for breeding chickens at home can quickly to make, having a thermostat with indicator light on and the cord with plug (eg, burnt-out iron), a couple of 300 Ohm tubular...
IT ALL STARTED WITH GLIDER
In 1921 pyatnadcatiletnij student Alexander Yakovlev read a book on the history of technology. In one of the chapters talked about the emergence of aviation, there was a model...
