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
IN SUMMER — MOTORCYCLE, IN WINTER — SNOWMOBILE
Snowmobile technology is finding increasingly wider application today. Industry and amateur craftsmen create the most diverse machine designs, specifically intended for winter operation....
FIGHTER-INTERCEPTOR F-94 STARFIRE
At the end of the Second world war the allies: USA, Britain, France and the Soviet Union tried to demonstrate their peaceful intentions. The United States, to acquire nuclear weapons,...
