1. In this experiment, the greater diameter of gum-roll is, the smaller the rate of hulling by admixture is. 2. The faster circuit speed of gum-roll is, the smaller the effect of fall of the rate of hulling by the admixture is. 3. The smaller a space of gum-roll is, the less the effect of the admixture of soya bean is, and the smaller the rate of fall of hulling is. 4. To pursue true character of growing dust to sting the worker's skin or his uncovered body. To survey the removal effect of dust elimination using model hulling machine. 5. To find through microscope that Bown, chaff, Awn minute sand consists of dust-above all Bown (Pric home) are found very much. 6. Among the there forms of hulling machine, cool-absorb-eliminate equipment machine is most superior and abrorb equipment machine is less superior and no equipment machine is most inferior of them.
By fitting the cylinder with various sizes of leakage-hole, the effect of the leakage of working gas upon the faculty of diesel engine was investigated, and the following facts were found. 1. The amount of fuel consumption (gr/hour) advances owing to the increase of gas leakage, but each minimum fuel consumption (gr/IP-hour) is plotted on the same out-put of maximum thermal efficiency. (Fig 2). 2. Maximum horse-power diminishes linearly in proportion to the increase of cross-sectional area of leakage-hole as far as the same amount of fuel is supplied. 3. For practical use, the faculties of diesel engine are not almost affected by the use of leakage hole less than 1mmφ. 4. The amount of piston ring blow-by and the temperature of exhaust gas are fluctuated with close reference to the width of leakage area, r. p. m. and load. 5. The relation between the degree of leakage temperature and the declination of properties of oil. is given.
We tested the relation between shapes of lugs and rolling resistance on the garden tractor under the same three conditions as Report 1. Shapes of lugs were same as report No, 1. The result may be summarized as follows. 1) Increasing the height of lugs, increased the rolling resistance but the efficiency was almost equal. 2) When the angles of spade lugs were small, rolling resistance was small under the well packed soil. Angle of the spade lugs hardly effect to the efficiency of the wheel. 3) Rolling resistance of the 32 and 40 tooth lugs were nearly same. 4) Extension angle lugs increased the efficiency materially on the pulverized soil.
1. The force tangential to two dimensional curve of plow body is transmitted to unplowed soil as it's absolute value, and leave vertical force on the surface of plow body. 2. According to upper cosideration, transmitted force to unplowed soil will be calculated by differential equation (3). 3. As to simple curved plow body, the force P will be determined by equation (4), and shearing conditions of unplowed part of soil are simultaneous equations (4) and (5), the latter is regarded in report (1). 4. As to connected curved plow body, P will be computed by epuation (6), but result is omitted. 5. An illustration of calculation as to simple curved plow body i presented. As results of calculations (Fig2, Fig3), the height of Furrow sliding upon plow body increase as plowing depth h, cohesion c, and share angle a increase respectively. This considerations explain some items in actual plowing.
Up to the 6th report, I treated of the theoretical treatment or ordinary sifting mechanism. From the 7th report, I intend to report the uncommon phenomenon which I can not explain by my sifting theory. In this report, I should like to explain the result of experiments.
In this paper anther practised measurements on P (the required force for hulling action) and H (the hulling rate) of huller, giving one paddy at a time to clearance of two gum-rolls under various R (the revolution ratio). The results obtained may be summarized as follows: 1. The relation between R and P is indicated in fig. 1. The force P makes a rapid rise at larger atio R than 23.5%. 2. The curve shown in fig. 2 means the relation between R and H. Although the rate H is influenced by the clearance of two gum-rolls, it is higher at larger ratio R than 23.5%, too. But in this case the injuring quantity of a hulled rice is increased. 3. From the above results, the practical revolution ratio R in optimum is considered to be about 23%.
We examined the location of center of gravity and its weight for many plows, and analysed the relationship between the center of gravity and plowing condition that a plow had the best stability. We found the formula between the center of gravity and the draft resistance. If this formula is permited, a plow gives the best stability and the easiest draft, and then a plow has the self-controlled action in the certain extent of working depth. When we wish to increase working depth, we can do it by putting on weight to the location of center of gravity which is lied on the vertical plane, containing the true line of draft. Draft resistance and coefficient of resistance of a plow that was added weight, was smaller than that which was increased working depth without loading.