The authors have made investigations about diamond wheel grinding in which plunge cut method by plain cup diamond wheels of bronze bonded was adopted. In this paper the influences of the diamond concentration of the wheel on stock removal is discussed theoretically and experimentally. And surface roughness produced in the grinding tests is also described.
Theoretical investigation shows the tendency that stock removal decreases with the increase of the diamond concentration of the wheel if assumed the wheel having the abrasive grains whose tip has spherical shape, and the similar tendency was recognized in the grinding tests to some extent.
Characteristics of the stock removal-normal grinding force (or contact pressure between the wheel and work surface) for a diamond wheel was clarified.
It is also known that surface roughness H_max decreases with the increase of the diamond concentration of the wheel.

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The behavior of swallen upheavals around the discharge point owing to condenser discharge has close relationship with discharge scattering and short circuiting.
Especially, if we may know the speed of swelling-up after the discharge was experimented, some unknown problems about mechanial phenomena of discharge can be made clear.
This report shows the measuring equipment of swelling-up speed of upheavals and the result obtained from measurement.
In this result, the time from the beginning of swelling-up after dincharge to the occurring of short circuit, is 7001500 micro-seconds under the condition of 200 Volts, 100 micro-farads, and it is long enough compared with discharge duration (3050 micro-second).
The writer, besides, inade some consideration on several unknown problems about electrical discharging, presuming from the resultant.

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The effects of the metallic soap in the emulsion type grinding fluids on the grinding phenomena were investigated in cylindrical grinding of the steel containing 0.37% carbon.
Six kinds of metallic oleates, oleic acid, sulfur and chlorinated paraffin were respectively used as the additives. Moreover, the water and the non-additive emulsion were used to compare with the grinding fluids containing the above additives.
As the results, the metallic soaps were found to be generally effective in decreasing the volume of grinding wheel consumed, in increasing the volume of metal removed and the grinding ratio.
And then, the change of the grinding speeds did not influence the above effectiveness of the soap.
The effectiveness of the metallic soaps was changed by the kinds of metals in the soaps, but had no relations to the position of these metals in the electrochemical series and the wear resisting properties of the soaps in sliding contact of steel.

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The wet-type gas meter is a kind of apparatus to measure the volume of gas. When the meter is placed along a pipeline, it is rotated by the torque that result from the pressure difference of gas between the inlet side and outlet one of the meter, and the number of rotations shows us the integrated volume of gas that flowed through it.
The author attempts to control the flow of gas precisely by a gas meter of this type. In this experiment, the gas meter is rotated at constant speed by external torque and the pressure difference is controlled to be zero.

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Following the preceding papers, in which we analysed the forms of the out-of-roundness decided by the geometrical arrangements of the wheels and the work, the forms of the work centerlessground experimentally under the working conditions of light cut, are shown in this report. The results are as follows:
1. There are forms of the out-of-roundness proper to the center-height and the formula n_e≅π/γ, obtained analytically in the preceding papers, is correct enough to be used practically.
2. The most frequent form of the out-of-roundness having odd number of corners is a triangular one and its out-of-roundness increases as γ decreases.
3. The out-of-roundness having even number of corners decreases as its number of corners increases.
4. There is the most suitable center-height with which the out-of-roundness becomes minimum and it is in case of γ=7°.

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In this paper, the writer treats the followings.
1. Theoretical profiles of cams which are used in indicating balances.
2. Mathematical methods to design the substituted circular cams which are used in practice instead of the theoretical ones. The accuracies of ±0.00008 (inclination range of the pendulum: 0.10.8 rad. ) and ±0.00015 (0.11.1 rad. ) have been got by the methods.

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In this report the influences of the action of stylus on surface roughness curves, were considered. In the same way as the 3rd report, an approximate formula of the output curve of a cosine input was found, and the deformations of a cosine and a triangle curve were calculated.

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