We measured the slight fluctuation of the wavelengths of the red spectral line of Osram type Cadmium lamps made by the Tokyo Shibaura Denki Co. in terms of the international wavelength standard defined by the red spectral line of the Michelson type Cadmium lamp. Since most part of the red-shift of spectral lines are due to the pressure effect of the gas enclosed, we deduced a general relation between discharge voltage and wavelength of the Osram type lamps based on Stefan-Boltzmann law of radiation. Applying this relation to the measured values, we obtained the relations between discharge voltage and wavelength of seven Osram type lamps used in this experiment, as well as the pressure effect constant of Osram type cadmium lamps enclosing argon. Our precise measurement of the wavelengths of the spectral lines of Hg¹⁹⁸ and Kr⁸⁶, intended this year, will be carried out based on the wavelength of the red spectral lines of the seven lamps mentioned above.

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In recent days, many types of oxygen analyzer were appeared in use. Until now, the cabon dioxide analyzer was usually used for combustion control, but it has many inadequate points, such as, poor aspirator, difficult maintenance, inflvence of source voltage variation, and effect of presence of hydrogen gas etc. Beside, the variation of carbon dioxide percent for the change of fuel air ratio is same order as the variation caused by other influences mentioned above. In this respects, the oxygen analyzer was required for the pourpose of combustion control. The writer will discuss about the three types of oxygen analyzer, catalytic combustion type, thermo magnetic type, and orsat type, and will also shows the results of uses.

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In the first three sections of the Part IV, the author had described the method of graphical calculation of the dynamic error I10. (Keisoku, Vol. 5, No. 4) This paper, section 4 of the Part IV, also presents a method of evaluation for the typical recording instruments which had been classified in Part I. When the Recorder receives the periodic input and the spectrum density of input signal Gi(ω) is known, it will be most reasonable to make RMS error minimum. The RMS error is given by the following equation
where Y₀(jω) is the transfer function of measuring system and the delay time t0 should be decided to make RMS error minimum. Fig. 3 shows the method of graphical calculation of the error vector |1-Y₀(jω)e^jωt0| for the typical periodic input such as rectangular wave. Figs. 2, 5, 7 and 8 show the some examples of the dynamic behaviour for the specified periodic input. Table 4 and Figs. 1, 4, 6 and 9 represent the results of evaluation of the typical measuring systems for the rectangular, triangular, trapezoid and indented input waves θi(t) by the standardized RMS error.

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[in Japanese]

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