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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A ROTOR SAIL ON A CATAMARAN
I would like to tell the readers of the magazine about a catamaran whose movement was achieved using the Magnus effect.
The Magnus effect consists in the fact that when a rotating body...
BALL OF PAPER
Plastic body ball point pen is often broken, especially at the tip, near the writing unit. Operational offer a way out: to tighten tight the rod in a paper tube, taped the edge of the...
