羽幌炭砿築別砿における炭車回転状況に関する2, 3の問題

抄録

There are many researches and reports about underground transportation. But they are almost on the machines, snch as belt conveyers, winders, locomotives, etc. And I have scarcely met the discussions concerning the transporting system of underground traffics. In recent years, the methods of contineous transportations have been exceedingly developed, nevertherless the mine tubs are still essential in the mine haulage system.
On this paper, the auther described some numerical conclusions about the circulations of mine tubs at the Chikubetsu Coal Mine, Haboro Colliery, in Hokkaido. And I think these conclusions have general meanings for underground mine tub traffic.
Conclusions.
(1) The distribution of frequencies of circulations of mine tubs shows Poisson's one.
(2) The circulating time is proportional to its distance, which indicates the number of tubs containing in one circulation.