Using the Optical Profilograph, the author measured the effect of the slight revolution of the plow bottom upon its shape, comparing Japanese plows with Western plows, and obtained following results; 1) The Japanese plow is more stable in its shape than the Western plow. 2) With regard to the stability, the share of the Japanese plow has approximately the same tendency as its moldboard, whereas the share of the Western plow has a quite different character from its moldboard which is more unstable than the moldboard of the Japanese plow but seems to be superior to it in regard to the inversion of furrow slice.
To study the draft of implements mounted on small tractors, the authors made a device for measuring three components and three moments of draft. An implement is attached to a frame that is supported on the device by twelve small plates on which the electric resistance strain gages are sticked. Each gage is connected to a pen writing oscillograph, which also records time and distance on a strip-chart. By this device we can know three components, they are horizontal, vertical and side forces, and three moments.
Such fertilizers as granular urea etc. which have respectively smaller amount of bridge spaces in the structure of particle disposition, not only have less differences between their void ratios when ordinally packed in a vessel and their critical void ratios, but also have occasionally the larger former void ratios than the latter. So that, they are potentially easy to collapse and flow, and kineticaly easy to expand and reduce internal friction remarkably when sheared. In addition, they have less coherency which prevents the increase of volumes and void ratios. Consequently, their fluidities is high. On the other hand, in such fertilizers as fused tricalcium phosphate etc. which have larger amount of bridge spaces in the structure of particle disposition, there are relatively large differences between two kinds of void ratios. In addition, they are kineticaly difficult to expand and reduce internal friction when sheared and have larger coherency. Consequently, they have low fluidities. As mentioned above, the relation between two kinds of void ratios is the potential dominant factor whicn controls the ease of flow of fertilizers.
We can prove that the theory of thrower action which has stated in the first report agrees the results of the experiments. Through the experiments it can be known that the shape of the blade is reriously concerned the efficiency of the machine. The conclusion are as follows. 1. To use the blade having side-boards can be obtained the high efficiency. The height of sideboards is recomended from 10 to 15mm. 2. The blade having inclined rear board to gather grains is effective to obtain the high efficiency. 3. The blade having nylon wire bushes on the front edge can improve the action of the thrower.
The relation between the hours in and the expense for operating a sprinkler has been studied, employing kerosine, gasoline, diesel engines and electric motor. The results of calculation of the expense for driving and maintenance of these engines under various conditions have revealed the following facts. 1) The expense per hour is adversely proportional to the length of operating hours in a year, and this tendency is emphasized in case an electric motor is employed. 2) As to the internal combustion engines, a gasoline engine is the most expensive, being followed by a kerosine and diesel engine in order. 3) An electric motor is the most economical when the operating hours in a year is long and the distance between the three-phase line and the setting situation of the motor is short, but it is not the case if such conditions as abovementioned would not be satisfied. 4) Generally speaking, a great difference in the expense will be produced among the various kinds of engines when they are driven for a long period of time, though there appears little difference when they are driven for a short period of time.
We investigated the mutual relation between the garden tractor and link appratus on the study for hitching of garden tractor. The draft-sladge was pulled by garden tractor with link apparatus, and max. draft force, handle reaction were measured. The point of draft was moved simply by changing the length of link AB. The kinetic working of the point of draft of link hitch was the same as that of fixed hitch. That is, max. draft force increased and handle reaction decreased by moving forwards the point of draft of garden tractor.
Hoes made with stainless steel instead of common carbon steel have several profitable properties, such as good corrosion resistance and durability, low cutting resistance and soil adhesion and the easiness to use. On the effect of welding processes upon the properties of hoes made with SS and SUS, using alternating current electric arc welding, argon gas and acetylene gas welding were studied, respectively. An amount of abrasion by a soil, weight loss due to corrosion by five per cent ammonium sulphate aqueous solution and the tensile properties were determined as to a factory manufactured goods severally welded.