DRILL A HOLE IN THE EXACT SPOT ON THE OTHER SIDE OF THE WALL

drill a hole exactly right with compass & magnet image www.handyhomehints.com

Interior Orientation

To locate identical positions on opposite sides of a wall, we showed a method using a bar magnet and pocket compass in October 1943. The magnet, attached to a suction cup, holds the position on one side of the wall. On the other side, a compass points to the magnet so the spot can be marked.
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Henry Sapiecha

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