In case the theoretically derived cams are used in automatic balances, many defects have been frequently experienced in the points of their production cost and mechanical machining. Practically speaking, it is believed more convenient to use the substituted circular cams than the theoretically derived cams. In the prevailing method for finding the substituted circular cams, the fulcrum, as very often discussed in this journal, is moved from the center of the circle on its diameter line, and accordingly the cams thus derived are quite symmetrical to its diameter lines. In this paper, this method is called "Symmetrically Decentered Method" only for convenience' sake, In automatic balances, however, cams always rotate only in one direction, in other words, in positive direction from the zero points. So, it is easily understood that more accurate results can be obtained in moving its fulcrum off the diameter line than in moving it on the diameter line. This method called "Asymmetrically Decentered Method" is, as mentioned in the following, to determine the distance d or d/R between the circle center and fulcrum and the angle β between the diameter direction and decentered direction, so as to get the desired accuracy.
In the former method, there is only one variable or the distance d between the fulcrum and the circle center, while in the latter method, two variables d and β. In the latter method, satisfactorily accurate results can be obtained, though calculation is a little more complicated than in the former method. You will surely find this fact if you make the calculation yourself.
This method has been applied to automatic balances of 10kg capacity since a few years ago and as its result an accuracy of ±1/1500 has been observed. Thus, the balances have won good reputation since they were put on the market. The author feels very sorry he is unable to give the numerical data of this method in this paper, because he has lost them.

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Discussed in this paper are the effect of the slit to obtain the light beam towards the "Pattern" in the photoelectric rotary "Pattern" function generator and several applications of this device except to the function generator. It is shown that with adequate slit width and length selected, the low pass filter, clipper and modulator can be made through optical process. Also given are some experiments on the filtering, adding and clipping carried out by the device equipped with a large diameter cylinder: Applications to curve analysis and other uses are referred, too.

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Creep phenomena occur not only under tensile strength, but also under compressive, torsional and bending stresses, and they are called compressive, torsional and bending creeps respectively. Especially in the bending creep, larger creep strain can be caused in shorter time even under lower stress than in the tensile creep. As these data can be immediately applied to the spring materials in measuring instruments or communication apparatus and yet its study has scarecely been made up to now, it is believed that the bending creep will present a very interesting problem. Given in this paper is a new apparatus for measuring the bending creep, which picks up the bending creep strain of a canti-levered specimen, enlarges it using the relay circuits and Pt contact and automatically records it on the chart. Its sensitivity is 8/1000mm, enlarging ratio 75 and error±3/100mm. Using this apparatus, curves are recorded in a form of step function curve, from which the continuous creep curves can be determined. The ability of this apparatus is not yet fully satis-factory because the value of the bending creep strain in the spring materials is very small. The authors, however, intend to contrive a better apparatus which can measure the bending creep in various materials under various conditions.

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