Here are presented dynamic responses of continuously stirred tank chemical reactors which generateheat. Dynamic relations between heat transfer process and chemical reactions such as reversible, irreversibleand consecutive reactions are analysed by use of transfer function technique, in consideration of heatcapacities of cooling water and reactor wall. Analogue computer experiments show that the step responsesof reactions are greatly influenced by heat capacity, flow rate, etc. of cooling water.

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D-C amplifiers are indispensable for analog computers, measuring instruments and industrial controlequipment.
One of major considerations of the amplifiers is the minimum detectable signal which usually issubject to restriction by the drift.
With synchronous clamp technique, reduction of the drift can be achieved. This technique is verysimple and yet effective.
This paper presents both theoretical and experimental analyses of the effect of synchronous clamp ind-c amplifiers.

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In the high-order automatic control system, it is difficult to know whether the system performanceis in over damping or under, even if the characteristic equation of the system is given. In this paper, thesystem performance is defined to be in over damping when the roots of the characteristic equation are allnegative and is defined to be in under damping when the characteristic equation has more than one pairof complex roots. It is proved that the principal conditions to determine the boundary between overdamping and under damping are derived from the characteristic equation and its derivatives. Here isgiven a new method for obtaining the overdamping region in the stability chart of the system by use ofthe foregoing result.

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The moisture balance here reported is an apparatus for measuring the surface adhesive moisture ofgranular solid substances. This moisture balance is based on such theoretical foundation as the volumeof a sample is dependent on its moisture content and the buoyancy acted by water upon the sample isproportional to its volume.
Scale pan D is suspended from point A of one arm of a balance with fulcrum K and vessel Rimmersed in water is also suspended from point B of the same arm. By the aid of auxiliary weight W', the balance is in a state of equilibrium without sample.
A sample is placed on pan D and counterweight W of variable mass is suspended from point P ofthe other arm of the balance. Then, the balance is brought into equilibrium by adjusting the mass of counterweight W. The masses of the sample and the counterweight are unnecessary to be known.
The sample is transferred from pan D into vessel R in water and an equilibrium of the balance is regained by sliding counterweight W to point Q.
Let distances KA, KP, KB and KQ be L, l0, l0 and l respectively and densities of anhydrous sample and water be ρ and ρ_w respectively. Distance L is so determined as to satisfy the equation
_??_ ……(A)
At this time, if the rate of moisture content of the sample is denoted by x, the following equation is formed:
_??_ ……(B)
The specific gravity scale is graduated on the KP arm according to the equation (A) and the moisture scale on the KB arm according to the equation (B).
The specific gravity of anhydrous sample can be measured with the moisture balance.

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