[in Japanese]

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A relatively simple and precise pneumatic micrometer is proposed. The original idea comes up from an analogy between the solex type pneumatic micrometer amplification characteristics and electron tube dynamic characteristics. The instrument is composed of two similar solex type pneumatic amplifiers, the one has a jet nozzle which is held by the spring-bellows, the other is connected in cascade to the former through the pressure-displacement transducer. By feeding back the output gaging pressure into the jet nozzle position through the spring-bellows transducer, the output characteristics can be improved linearly in wide range. By employing the spring with an adequate constant, any amplification can be easily obtained without changing the pneumatic circuit element.

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In order to provide the basis for the standardization alcohol-meter at this institute, the investigation of ethanol-table was undertaken two years ago. As the first step, specific-gravity of pure ethanol was determined.
Almost all the published data for specific-gravity of pure ethanol are based on the results of direct measurement of absolute alcohol, but this kind of alcohol is extremely difficult to make. Therefore, the specific-gravity was determined by means of the following methods :
1) Measurement with picnometer of specific-gravity of the sample of nearly pure ethanol.
2) Measurement of the contents of water contained in the sample by Karl-Fischer method.
From these two measurements, a relation was obtained between concentration and specificgravity of nearly pure state of ethanol, and by the extrapolation of this relation the specific-gravity of pure ethanol can be calculated.
Thus, the value 0.78498 was obtained as the specific-gravity at 25°C pure ethanol saturated by air at an ordinary atmospheric pressure. This value is closed to the Osborne's rather than the Gay-Lussac's.

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This paper describes input-output devices of a industrial process computer for computing control. The functions of this system can be devided into two portions, one is for telelogging and the other for telecontrol for modulation of control mode and set point adjustment which can be performed by pulse train from computer output. As the extensions to the computer ETL Mark IVA, transistorized general purpose computer, there are channel selector, A-D converter, data display and printing mechanism for telelogging. For telecontrol, channel selector and pulse cord-number convertor are attached to the computer.
The A-D conversion circuits consist of a comparator and D-A converter, and are controlled by computer. The flow chart of program for A-D conversion is shown in Fig. 5.
The orders newly provided in addition to those of Mark IVA are shown in Table 2. Experiments of computing process control system have been performed through-digital process simulator.

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