This experiment shows that the mathematical relationship for standing wave frequency derived above is accurate. The results of the experiment are not exact due to some limitations in the setup. Also the relationship between the fundamental frequency and the successive harmonic frequencies is correct.
If this experiment were to be repeated a few things could be different to improve the accuracy of the results. Placing the sonometer into a vacuum would eliminate air resistance, just as in the wave equation. Adding a stronger bonding force between the bridge supports and the base would eliminate some of the bounce in the string. This would make finding a frequency for standing waves more accurate.