a. In a mine shaft, the first wood frame of the shaft; sometimes used in reference to the mouth or portal of the tunnel. BCI
b. Supporting framework at top of shaft from which linings may be hung. Pryor, 1
c. The junction of a mine shaft and the surface. Nelson
d. The beginning point of a shaft or drill hole, the surface. Ballard
e. The mouth of a mine shaft.
f. The bar, or crosspiece, in a framed timber set. Stauffer
g. The term applied to the timbering or concrete around the mouth or top of a shaft. Lewis
h. Scot. A frame to guide pump rods; the fastening of pipes in a shaft.
i. The mouth or opening of a borehole or the process of starting to drill a borehole. Long
j. A pipe coupling or sleeve. Long
k. See: friction head
l. A sliding ring mounted on a shaft so that it does not revolve with it. Used in clutches and transmissions. Nichols, 1
Source:
Dictionary of Mining, Mineral, and Related Terms












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