抄録
An experimental research in the mechanism of the ignition and the air-fuel mixture in the internal combustion engine was carried out. The fluctuating nature of the ignition-delay in the Diesel-engine was analysed statistically and we found that the probability of ignition in unit time of the liquid fuel, which was injected into the combustion-chamber, was nearly proportional to the time. For the explanation of these changes of ignition probability, the diffusion-phenomenon of fuel was discussed.