The necessary equations for the use of the electrostatic velocity analyzer as an energy spectrograph for &bgr;‐particles are derived. A table is presented in which the conversion factor for converting particle‐counts as a function of the electric deflecting potential to particle‐counts as a function of energy is shown for electron energies of less than 105electron volts. At low energies the conversion factor does not cause the excessive distortion of the observed curve that the conversion factor for the magnetic spectrograph causes in the same low energy region. It is thus concluded that the electrostatic analyzer is suitable for the investigation of the lower reaches of the continuous &bgr;‐particle spectrum.