The "fox" was a seat suspended by pulleys from an overheadrope, much like the device sailors use to transfer men between ships.
狐蝠是从高架的绳子的滑轮上悬下来的座椅，很像水手使用的在船与船之间进行人员转移的装置。
2
There was no ceiling, only crooked, bare rafters overhead, conveniently accessible for a rope to hang from. A most suitable place, indeed, for such a purpose.