The frequencies with a lower number of nodes (3 to 9) were easily visible to the naked eye. At higher frequencies, a piece of paper held gently against the hoop was used to locate and count the nodes. The paper would vibrate and buzz anywhere on the hoop except the nodes.
Just like our straight wires, the bending of the wire hoop is governed by Young's modulus for the metal that comprises the wire. When the load on the hoop is increased above the elastic limit, the flexing of the wire becomes erratic.
After this picture was taken, the wire broke right at the clamp and sprang free, leaving a 1.5 cm section of wire inside the clamp itself. A little repair work with an allen wrench and we were back on track.
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