Method:
Measure the original length of the wire (to the reference marker) with the ruler
Measure the diameter of the wire with a micrometer
Add a mass and calculate the weight of this mass
Measure and record the extension of the wire with respect to the initial position of the reference market at 0 load
Add more mass (and calculate each weight) and record each extension
After each extension, remove the load to see if wire returns to its original length
