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How does the trick with the screwdriver work, exactly?
by ruricolist 9y ago
How does the trick with the screwdriver work, exactly?
- ggg9990 9y agoWater content drastically changes the acoustic transmission properties of porous materials. A tap with a screwdriver is pretty close to a pure impulse, which means it contains all possible sound frequencies overlapped. By tapping wood, listening to it, and then cutting it open, you an learn a correlation between the sound and the water content of the wood and avoid cutting wood too early or too late.