The nail violin is a musical instrument was invented by German violinist Johann Wilde in 1740. It consists of a semicircular wooden soundboard with iron or brass nails of different lengths arranged to produce a chromatic scale when bowed with a violin bow. Nail Violin Materials • Piece of 1/2" plywood, 12" x 6" or larger • 5 nails: Three 12d, One 10d, One 8d • Violin or cello bow, or general instrument bow Step 1: On the plywood, mark out an arc by using a compass set to 5" (or do it freehand). Step 2: Starting 1" from the edge of the wood, pound in nails every 1-1/2" along the arc–putting the largest nails at the top and the smallest at the bottom. Don’t hammer them too deep. Tune the instrument: raise the pitch of any nail by hammering it in; lower the pitch by carefully pulling out a little with the hammer's claws. If the nail will not pull out, use a metal file to gently file away a small notch near the base of the nail. Step 3: Tune to: D, E, G, A, B Variations: Of…