Wooden box used in mines ?

[morthin]

I purchased this wooden box measuring  11"x7"x 6" in an antiques fair, the seller stated that it was used down the mines. Anybody have any ideas of what it was used for if it was in a coal mine? 

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[John]

Sept 10, 2018 13:52:07 GMT -5 morthin said:

I purchased this wooden box measuring  11"x7"x 6" in an antiques fair, the seller stated that it was used down the mines. Anybody have any ideas of what it was used for if it was in a coal mine? 

Surveyors theodolite??