Equipment typically required (per demo or investigation):
Bridge pieces are usually small wooden blocks with a metal edge which can be placed between the wire and the soundboard at any point along its length. They essentially adjust the length of the wire, creating a range of frequencies. Part of this investigation may involve changing the length of the wire using a bridge and seeing how this affects the frequency of the audible note produced when the wire is struck.
Some groups may want to produce a specific frequency with the aid of a tuning fork. Most tuning forks have a frequency printed on them which represents the frequency that can be produced when the fork is struck. Students may be able to reproduce the frequency generated by the fork on the sonometer simply by listening to the audible note produced and comparing the two, adjusting the masses or bridge until the correct note is produced. Again, using an oscilloscope and microphone the frequency produced can be checked a lot more accurately.
The contents of this page are for information only. Please refer to CLEAPSS, SSERC or ASE safety advice and/or publications before undertaking any preparation, practical experiment or using any equipment featured on this site or any other.