Didn't take the picture so I go find one on google instead
This is an oscilloscope and we can measure any waves by use of a transducer.
This is a picture of how oscilloscope work
In this oscilloscope the graph on the screen is appear by shooting electrons on the screen after passing through different plate with positioned vertical and horizontal. Each is one positive and one negative. The graph of the electron can be produced by changing these plates charge to create the graph depends on the voltage .
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