plumming
English
Verb
plumming
- present participle of plum
Noun
plumming (uncountable)
- (mining) The operation of finding, by means of a mine dial (compass), the place where to sink an air shaft, or to bring an adit to the work, or to find which way the lode inclines.
References
- plumming in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.