The design feature of a direct-reading spectro-analyser with emphasis on the electronic circuit design is presented in this paper. This instrument is stable, speedy, and accurate. The first and second order spectral ranges are respectively 2000-6000 and 2000-3000?. The mechanical construction of the optical system is so characterized that two (for first order) or four (for second order) pickups can be set exactly on the same spectral line. A line-frequency, high-voltage and high-energy spark source system is employed with adequate sensitivity. The measuring system consists of a pulse amplifier, a rectifier, an integrator, and a pulse counter. The operation of this instrument is completely automatic after the mounting of the sample. Finally, typical operational data are illustrated.
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