（解説文要約）
切羽から運搬坑道まで石炭を運ぶと、スラ棚と呼ばれる炭函の高さぐらいの棚があり、

そこから炭函に石炭を直接流し込みます。

能率的ではありますが、炭函が来ないときは、切羽に石炭が溜まり、作業が進みません。

 

 

 

 

 

This type of platform was called a Suradana,and was placed where two drives met.

One drive is the main drive where coal skips ran, and another drive is the narrow drive reaching to the coal face.
This Atoyamais loading a box of coal directlyinto theskip.
While this was very efficient, there wasn’t always an empty skip available.
Thus, coal would begin to hinder the hewers because of the coal face getting backed up with coal.