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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Many hobbyists and tinkerers have a tabletop lathe woodworking machine STD-120 and its modifications. There are machines and in school workshops. The presence of such equipment allows...
