For improving the performances of an open-chamber diesel engine, it is important before everything to improve the combustion process of the pre-mixture and the mixture formation followed immediately by the combustion.
In the present paper, it was investigated how much the flame progress, which is varied with the locality of the pre-mixture formed by auxiliary fuel, effects on the performances of engine, especially, the engine output, the exhaust smoke and the NO concentration. The results obtained may be briefly summarized as follows:
(1) If the auxiliary fuel is located at easily ignitable zone of main spray, for example, the top or the middle part of the spray, the exhaust smoke clears faintly off, but the engine output decreases. Thus, it is most favourable to distribute the auxiliary fuel at the root of main spray.
(2) The double injection method using a single injection nozzle is not effective against the improvement of engine performances. This is because the pilot fuel is placed at easily ignitable zone of the spray injected later. To make a more fruitful use of this method, the pre-mixture of pilot fuel should be more lean by injecting the fuel at an earlier stage of the compression stroke.

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In this paper some Totalization and Systematization of the following analyses are discussed;
(1) Multiple Regression Analysis abbreviated as MRA, which is corrected with MSD (Multiple Screw Drive) method.
(2) Principal Component Analysis abbreviated as PCA.
(3) Connected Anlysis between PCA and MRA, which is given by the name of SAPCR. SAPCR is an abbreviatted notation for Structual Analysis Type of Principal Component for Regression.
Some results of the above analysis on marine engine failure data are shown with an objective variable of Man-hour per occurrence for not only NPS but also MRA. NPS is an abbreviated notation for the Normal Probability Scale in SAPCR.
It was cleared that two variables; ratio of repair men to engine crew (X₅) and total member of ship crew (X₂₈) of the human factors affected to the results of PCA in case of the turbine tankers, and that the following variables to the results of SAPCR; the ship's ages (X₉), R. P. M of main engine (X₂₃), the automation level of ship (X₂₄) and the evidence of failure (X₁₅) .

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Induction motor and centrifugal pump systems are often used under changing voltage source condition. So we performed test to clarify the influence of voltage variation and frequency change of AC generator. As a result of test we found the extent of change of the revolution of pump, total head vs. flow characteristics, motor input vs. flow characteristics effected by the change of generator voltage and frequency.
Change of revolution is plus or minus 0.8% for change of plus or minus 1% of frequency, respectively. Also change of revolution is plus 0.06% or minus 0.125% for change of plus or minus 1% of voltage, respectively.
According to change of revolution, quantity of flow, head and water power is also varied with ratio of a power, second power and thrid power, respectively. Furthermore, we find that we can calculate the former characteristics under unusual source voltage and frequency condition, if we find such characteristics under normal source voltage and frequency condition previously.

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