As the cement rotary kiln process is a series combination of the sintering, calcining and drying zones, there sometimes occur unstable phenomena. Genarally speaking, the reason is classified as follows:
1) Swing of process itself caused by abnormal state of material's travelling speed.
2) Less measurability and difficulty of predicting internal disturbance.
In this case, the profile of the solid temperature passing through the inside of kiln is disturbed. This paper partially refers to this longitudinal profile of the solid temperature and its own self-controllability of heat exchange. As a conclusion, it can be said that the key point of kiln process control depends upon the stability of material's travelling speed in the kiln because the kiln process itself has own driving force called self-controllability.

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An automatic manometer with digital counter has been developed with the purpose to measure the pressure0-10000mmHg (0-13.6kg/cm²) absolute with an accuracy less than 0.05% and to establish the standard of pressure. This manometer can measure both 1600mmHg and 3200mmHg absolute pres sures at the same time it measures the pressure near 10000mmHg absolute. As it is impossible to measure pressure with a single 10meter liquid column, this manometer has five columns, each 2.3meters high, and takes new summation methods to handle high pressure. In order to divide 10000mmHg absolute pressure into five columns, the manometer has an orifiec-series system which is in parallel with the column series. Gas flows from the pressure source through the orifice series, giving a differential pressure. to the both sides of each orifice. The orifices are adjustable needle valves and if they are adjusted ade quately, each column gives approximately equal readings. If fluid flow is very small, the perssure source will not be affected by the manometer. Three of the columns, called the high pressure side, measure 60% of inlet pressure, while the other two columns, the low pressure side, measure the remaining 40%. The high pressure columns are precision bore 18-8 stainless steel tube, while the low pressure columns are precision bore glass tube. The upper end of the lowest pressure column is sealed with a: “Torricellian”, vacuum. To detect the meniscus of the liquid column, a phototransistor sensing element is used for the glass tubes and a differential transformer with u-metal is used for the 18-8 stainless steel tubes. The output of the sensing elements is fed through the servo-ampilfier to the servometer which tracks the liquid surface by the zero method and simultaneously, manometer height will be indicated digitally by acounter through a gear train mechanism. This manometer can measure pressure with an accuracy of 0.025%, actually twice as, accurate as that of 0.05% appeared in the specifications. If more accurard standard is available, this automatic manomater is believed to show better data.

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The use of variable delivery axial plunger pumps is ever increasing in servo-mechanism, stepless variable speed transmission and others. To change the delivery rate, it is necessary to move the positions of some movable parts. The object of this study is to analyse the pump kinematics and to determine the operating force exerted on the movable parts and then to consolidate the design data of flow control mechanism or pessure compensator. Pump kinematics are different each other according to its construction design. This paper describes the pump usually called the Thoma or Janney type whose pistons are con nected to the driving shaft by their connecting rods. A swivel yoke has a tendency to change its tilting angle. This tendency or the moment depends on the construction elements, dimensions of the component parts and applied working conditions. The self-shifting moment is caused by such things as oil hydraulic pressures in the cylinder bores, pressure distribution change and pressure change both due to the overlap of valves, lateral force of the piston rods caused by the three kinds of pressures mentioned above, centri fugal force acting upon the pistons and the piston rods, the force from the universal link which is exerted by the bearing spring, and centrifugal force acting upon the oil inside the cylinder. The effect by each of them can be separately calculated and by summing up them, total shifting moment of the yoke will be obtained. The operating force should be applied against this total moment. The analysis appeared in this paper is verified by experiments. Experimental values nearly coincide with calculated values. Usually, there is an oscillation in the yoke and its causes are explained in the analysis.

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The ramp response, sinusoidal response and random response of the discontinuous damping servome chanism devised by the author have been investigated by using a digital computer. In this servomechanism, the system damping ratio is changed from a small one to a large one by discontinuously switchi ng the relay according to the switching function which depends upon the error and the error rate, so as to make the response optimal for the step input. As its result, it has been revealed that, by modifying the switch ing function, this servomechanism has excellent response characteristics compared with those of the linear system.

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Electronic control system requires a very reliable D. C. amplifier of high gain, high response and yet low noise. Magnetic modulator type D. C. amplifier is very reliable, but the amplifier of 100c/s carrier type does not satisfy all of the above requirements. Instead or 100c/s type, therefore, 1 000c/s type is employed. This D. C. amplifier consists of a 500 c/s oscillator, magnetic modulator, 1 000c/s tuned amplifier and power amplifier. The oscillator and amplifiers are transistorized. As a result of using the 1 000c/s carrier type, the following characteristics have been obtained:
1) Gain: 8×10⁴ (mA/mA)
2) Cut off frequency: 20c/s
3)Noise level: 5×10^-16W (i.e.0.002μA)
4) Ambient temperature: -10°C-+70°C
Also described are the applications of this D. C. amplifier to an electronic control system and electrical interference caused by A. C. power line.

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本学会は昭和35年8月工業技術院より面積流量計による流量測定方法JIS原案の作成について依頼をうけたので, 委員会をもうけ, 各種の資料をもちよって検討を行ない, ここに報告するような原案をまとめるにいたった.この原案は工業技術院の専門委員会において正式に審議されるはこびになるので, 内容, 用語についで御意見があれば, 当学会編集部 (東京都文京区本富士町東京大学工学部応用物理学科「計測と制御」編集部) あて, 至急御連絡いただきたい.

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