抄録
A Wadsworth Littrow type infrared spectrometer using a galvanometer has been built. Prism is a sodium chloride of surace area IIX 8cm and angle 65°. Detector is the thermo-couple which has a long time constant and sensitivity of 3 μV/μW at 760 mmHg.
Wave length of recording spectrum is linear, and slit is automatically opened by a slit cam. As the sensitivity of a galvanometer is 5×10-8 volt, slit must be considerably wide, so the resolution of the spectrometer is not good, nevertheless the 10μ band of ammonia was detected distinctly.
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