Abstract: Based on the stress analysis of steel wires placed horizontally，the measuring formula

of the young's modulus is derived，and then it is measured experimentally. Using the value of

young's modulus as a known parame- ter and steel wire as a strain sensor of the pressure，a simple

platform scale is designed and its measuring formula is derived to measure the gravity of unknown

object. Such a design makes the traditional confirmatory experiment im- prove to a designing

experiment，reduces the experimental error and also enriches the experiment contents.

Key words: young's modulus, reading microscope, platform scale