a. A rock fragment, cavings, or other obstruction that lodges (either accidentally or intentionally) part way down in a drill hole (such as in an oil well). AGI
b. Debris that plugs a borehole at a point above the bottom. Between the underside of the bridge and the bottom of the drill hole, the borehole is free of debris. Long
c. To deliberately plug a borehole at a point some distance above its bottom. Long
d. To form a bridge in a drill hole. AGI
e. In a cave, a solutional remnant of rock that spans a passage from wall to wall. AGI
f. A device to measure the resistance of a wire or other conductor forming a part of an electric circuit.
g. A piece of timber held above the cap of a set by blocks and used to facilitate the driving of spiling in soft or running ground.
h. Refers to the overburden used for spanning the natural gap between the highwall and the spoil, when such is required to establish a temporary machine surface standing area closer to the disposal area than that provided by the virgin ground. AGI
i. In an electric blasting cap, the wire that is heated by electric current so as to ignite the charge. Nichols, 1
j. Sometimes, the shunt connection between the cap wires. Nichols, 1
k. A plankway or elevator used in ironworking to convey fuel or ore to the mouth of a furnace. Webster 3rd
l. A refractory bar, or member, or fire clay placed across the surface of the batch in a tank furnace near the working end to hold back the scum, or gall. Mersereau, 2
m. The structure formed by the end walls of the adjacent melter and refiner compartments of a tank and the covers spanning the gap between the end walls. ASTM
n. See: air crossing
Source: Dictionary of Mining, Mineral, and Related Terms