A Simple analogue data processing method is proposed. This instrument consists of a rotatable transparent tube, optical system, adjustable slit and photoelectric amplifier. An analogue "Pattern" curve reproduced by any recording curve or wave form is used. Feeding the "Pattern" into slit mechanism, an integrated value, average value, continuous average curve and form coefficient in any sampling length selected for an arbitrary analogue recording curve can be calculated through optical process. The experiment conducted with an instrument manufactured on trial shows that the above arbitary curve can be evaluated with an accuracy of about 1%.

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Trigger characteristics of transistor flip-flop was studied. It is convenient to discuss the characteristic on C-R plane, where C and R represent trigger capacitor and diode-back-bias resistor respectively. The authors found three kinds of boundary lines; the first is a frequency-independent trigger boundary (DC boundary), the second a frequency-dependent trigger boundary and the third an anti-noise boundary. The area on C-R plane surrounded by these three lines is an allowable domain for that frequency. The values of C and R must be selected within this allowable domain. Communication capacitor aids high frequency gain and makes it possible to flip the flip-flop circuit by the positive feedback principle, but the anti-noise boundary goes too far to the right at the large value of the capacitor and there exists no allowable domain. The allowable range of the value of the capacitor is relatively narrow. The authors recommend the values of communication capacitor, C and R for both the low frequency use and high frequency use transistors. An interesting fact was found that necessary trigger current is minimum at the optimum C-R combination. The necessary trigger current is independent of the clock pulse frequency. The measured values of the necessary trigger current are available for expediting the design of clock pulse generator circuit.

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Recently, infrared gas analyzer has reached the state of practical use, but it is still poor in reliability for measuremet in low concentration range below several hundred ppm. Having made big effort, the authors have constructed an analyzer which seems to be most suitable for the above mentioned measurement. It employs a single source double beam optical null method. Its detector is an acoustic resonator, which is 100% filled with measured gas, and infrared source cell is as shown in Fig. 1. As an example of its performance, it shows an accuracy of ±5ppm in a 0 to several hundred ppm range concentration measurement of CO₂ contained in N₂. This article describes its principle, construction and performance.

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