Close-up view of an ion source and oscilloscope designed for use with the Bendix Time-of-Flight Mass Spectrometer. One of four component parts of a mass spectrometer, the ion source produces a beam of particles characteristic of the sample material for qualitative and quantitative analysis. An oscilloscope is a laboratory instrument commonly used to display and analyze the waveform of electronic signals, in effect drawing a graph of the instantaneous signal voltage as a function of time. The Time-of-Flight Mass Spectrometer (TOFMS) was the flagship analytical instrument of the Bendix Corporation.