
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.
Recommend to read
CUT… BEARING
Not find, perhaps, a car or complicated mechanism which isn't used ball bearings: they are embedded in devices and engines, airplanes, and tractors, bringing accuracy, reliability and...
PLIERS-HARVESTER
This unusual hand tool created by the innovators of the Volgograd plant of oil engineering. Pliers designed for flaring pipe lubrication systems and hydraulic control of various machines...