Any of the compass there is a limit in describing them circles. However, a circle of the desired radius can be obtained using… line. Just drill in it a large number of holes, then the first of them to insert the pin-axis and the other, stepping back to the desired distance, pencil. The circle will get no worse than that made by a compass.
Recommend to read
MAGNETIC LEVITATION
The one who had the opportunity to disassemble a conventional magnetic latch for a door, must have noticed how strong the magnet used in it. This leads us to the idea to use magnets...
COME ON, MIRROR, TELL ME…
If in the examination of any massive constructions (e.g. motor vehicle or its running gear) there is a need to inspect it from below, it will help the mirror. So that it is always at...