From this experiment, amount of gas leakage was proved to be much influenced by various driving conditions.
It may be summarized as follows:
i) At the most suited pre-ignition point, amount of gas leakage was least. As the ignition point receded from it, amount of gas leakage increased.
ii) Gas leakage decreases as much as B. M. E. P. more diminishes under the certain r. p. m..
Gas leakage increases as much as r. p. m. decreases under the certain B. M. E. P..
iii) The least amount of gas leakage yields at ring set of normal number, the next is the 1st ring only, and the most is the 2nd ring only, at the lower speed within 2300r. p. m.
These tendencies reverced at the higher speed more than 2300r. p. m.

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We investigated during the dry spell of 1951 the effect of tine in the cultivation. The results obtained from the experimentation are as follow:
(1) We could not find any effects neither on the weeding nor on the amount of harvest, but recognize some effect of this operation to prevent the percolation of rainfall.
(2) The soil mulching seems to have little effect on the conservation of soil moisture. Soil mulch can surely absorb rainfall, but it cannot prevent some part of rainfall absorbed by it from escaping. The effect of soil mulching, we think, has been over estimated.

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The auther had done the experimental studies of the two dimensional cutting of soil. The metal cutting theory or the ordinary soil mechanics had not been able to explain the experimental results.
In this paper the theoretical analysis of the soil cutting have done by solving the plastic equiliblium equation of soil with coulomb'ian boundary condition. Negrecting the weight of soil and using the characteristric of the slip surface, fundamental dif ferential equation (9) have been reduced to 2nd form of Fredholm's integral equation (21) and solved by suecesive substitution method. The results of the analysis confirm the phenomena of experiment, such as the minimum cutting resistance exist at about α=15°(Fig. 5), the shape of the slip surface (Fig 4) etc.

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We investigated the process of sticking condition of the soil on the surface of plow bottom at field, and we found tendencies as follows.
1) The film of soil is formed on the suaface of plow bottom by some certain causes which however we cannot yet understand, and gradually groves until it forms the primary layer or soil on the plow surface.
2) In the same process, it seems, the secondary layer is formed on the surface of the primary layer This repeats. over and over again until a large stable layer is grown up on the plow surface.
3) The thickness and the stability of the layer is determined generally by the soil condition.
4) Furthur invetigation will be made on the factor which determines the thickness and the stability of the layer.

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On the measurement of the radiant energy of infrared lamps, the thermopile trial produced by Electrical Experiment Station, Osaka-Branch and pin-pon-ball thermometer are used in this experiment. Temperature showed by pin-pon-ball thermometer y, is the function of the room temperature x, and constant a, due to the radiant energy, that is, y=a+x. The relation of a(°C) and the radiant energy W (watt/cm²) is W=0.000928a^1.47.
As the room temperature becomes high and the chicks glow, the required energy by the chicks decreases. Then it is the most econcmical method that the room temperature are raised and change the radiant energy to the heat so as to rise the room temperature effectively.

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1) この実験は衝撃式籾剥機を用いて籾の脱〓性の品種間差異を明かにする為に77種を供試して行つたものである。
2) 而して品種間脱〓性の大小を確然と判別する一手段として低位脱〓作用域と中位脱〓作用域, 即ち加速盤のR. P. M. 1800と2300の下に実験を進めた。
3) この実験の範囲内では早生, 中生種は一般に晩生種に比べて脱〓性が大きいもののように見受けられた。
4) 籾粒の大小と脱〓性の大小との関係は判然としないが, 同一密度のものであれば大粒は稍々脱〓が大きいもののようである。
5) 品種から言えば早生朝日, 農林1号, 真珠1号, 中生朝日等が概して脱〓性の大きい傾向を示し, 銀坊主, 農林31号, 農林2号, 名倉穂等は一般に小さく, その他は中間の数値を示していた。
6) 脱〓性の大小は同一品種に於いても, 相当の幅があるもののようである。
7) 又何れの品種に於いても不完全籾 (粃及び粃に近い籾) は完全籾 (完全豊満な籾) に比較して脱〓性が小さい数値を示している。
8) 以上の実験及び結果は厳密に言つて脱〓性の本質全部を追究したものではないので, 更に進んで脱〓に要する「力量」を簡易迅速に測定する方法を研究すべきであろう。

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1. Size of sprayed particles, the velocity of the wind and the distance reached by the particles were observed using the new Mist Blower.
2. Weakness of the velocity of the stream has no relation to revolution and is indicated as follows;
V/V₀=0.0363X^-1.533
Then V: Wind velocity at measuring point.
V₀: Initial wind velocity at nozzle.
X: Distance from nozzle to measuring point.
3. Applying Stokes' law, this formula will be converted into;
X=4.5ηH/ρ₁gr²{0.157V₀^0.3948(ηH/ρ₁gr²)^-0.6052+V_c}
Then X: Arrival distance of particle.
r: Radius of particle.
η: Viscosity coeficient of air.
ρ₁: Specific weight of a particle.
H: Height of nozzle from land.
g: Acceleration of gravity.
V_c: Natural wind velocity.
This formula does not coincide with actual obtained values due to not considering of diffusion, vortex and rising air current. Therefore, further study with respect to these points and dust paticles is expected.

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(1) For the amount of natural ventilation caused by density difference of dust air of the farm structore, considering the dust source existed inside of structure and perfect diffusion was held; the author obtained:
V=V_rlog_eV(c₁-c₀)-nxΔZ/V(c₂-c₀)-nxΔZ
denoting by V the amount of ventilation; w: the volume of room; c₁: the density of inside dust air at the first time Z₁; c₂: the density of inside dust air at the later time Z₂; c: the density of outside dust air; x: the amount of splashed dust per unit; and n: the number of dust sources.
It may be seen that c₂ decreases in reference to N_r, times of ventilations, as follows:
c₂=V(c₁-c₀)+e^Nr(nxΔZ+V_c0)-nxΔZ/e^N_rV
As for the dust source existed outside of srtucture, the above is simplified by denoting x=0.
(2) Sufficient exclusion of inside dust air can not be performed so long ass the effeciency of ventilaton reduces in as much as the amount of ventilation increases.
Efficiency of ventilation can be denoted by η_p and η_r, named respectively by author efficiency of purity and efficiency of residual. In this occasion, carried out η_p, and η_r resembling volumetric effeciency and scavenging efficiency in case of 2 cycle Internal Combustion Engineering.
Then η_p=c₁-c₂/c₁-c₀ η_r=1/N(c₁-c₂/c₁-c₀)
(3) Accounts are also given of he deducted amount of insufficient diffusion compared to sufficient diffusion taking consideration of η_p and η_r.

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The corrosion resistance of low carbon steel alminium, duralumin, copper, brass, zinc and tin were studied for 500, 1000, 1500 times diluted aqueous solution of uspulun and 800 times diluted aqueous solution of time sulphur compound, respectively,
The loss of carbon, steel in uspulun solution is great at large dilution and in linearly increase with time. In the case of the lime sulphur compound solution the loss is little at short time but is rapidly increase with increasing time. Alminium and duralumin behave same manner in uspulun solution but the loss of duralumin is rapidly increase with increasing dipping time in lime sulphur compound solution. In the case of copper and brass, the relation between the loss and the dipping time in uspulun solution is not clear so. Copperr is severely attacked by lime sulphur compound solution followed by repeating action of formation and fall off of the dark skin product on surface.

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This study was attempted aiming at higher power and economy of fuel of the oil engine employed for agriculture and industry, taking off a carburettor and by using a fuel injecting provision.
An oil engine with a carburetor has invariably a suction trunk which is extremely contracted and when the air passes through it, the pressure of air goes down. Because of this principle the engine of this type shows a fall both in power and efficiency of opacity when it suck up fuel.
To remove these defects we tried to inject fuel into the cyilnder from the nozzle, using a fuel injecting pump instead of a carburettor.
Consequently we got a successful result of going up in efficiency of capacity, and the power of the engine improved about 13% theoretically.
But as a result of testing it on practical experiment, the power improved about 8%, showing almost the same quantity in the consumption of fuel as the case calculated theoretically. The discrepancy between the theoretical case and the experimental one seems to be caused by the loss owing to the operation of the machine in the fuel injecting pump.

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I found the next formula on the coefficient of the frictional resistance of the gum hose (The common name 5/16″×2B) by my experiments.
Let h=λ⋅l/d⋅v²/2g
Then, I found
λ=0.092145 Re^-0.12
However
h=head loss of the gum hose in some length (m)
l=Some length of the gum hose (m)
d=Inner diameter of the gum hose (8.28×10^-3m)
v=Velocity in the gum hose (m/s)
λ=Coefficient of the frictional resistance of the gum hose.
Re=Reynolds' Number
When we think about the influence of high pressures. λ_p=λC_p
h_p=h×C_p×R_p
However
C_p=[1+0.000048p/(1+0.00085p)(1.002)^p]
R_p=1-0.000223p/1+0.00085p
p=Given high pressure

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As a partial study on the fundamental relation between crushing operation of soil and its optimum period, the authors applied various type of tines by static load method to cylinders made of clay which have different moisture contents and are 60mm in diameter and height, and measured resistance against crushing, properties of crushing, penetration, etc.
The relation between moisture ratio and resistance against crushing is shown in Fig. 2. Though I sphere which had larger moisture ratio than 45%, were easy in penetration, they were not crushed, and its trace only left. III sphere, which had moisture ratio less than 10%, increased in resistance suddenly owing to consolidation of clay clods, and soil crushing became difficult. Such being the case clay clods in the II sphere which had an intermediate moisture ratio are desirable from the viewpoint of crushing nature. And pierceing type and sharp cutting type are preferable for tines. Around 30% moisture ratio in case of the former type and 33-42% of the same in case of the latter type are considered to be the optimum period for crushing soil respectively.

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