If you need to drill through wall, out the other side exactly in the right place — use…a compass.
Of course, in collaboration with the magnet, which should be put behind the wall just at the desired point: it will show the compass needle.
Recommend to read
CAPACITORS-GEMINI
Often, in order to work in a range of electrical oscillations of sound frequencies it is necessary to select the same capacitors. This and various or balanced bridge circuits, and is...
LIGHT AND… FANTASY
As soon as we get a new apartment or refitting the old capital, followed by furniture there is a question of lamps. And if the industry had long ago mastered the production of sets of...
