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Total Magnetic Intensity
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The vector resultant of the intensity of the horizontal and vertical components of the Earth’s magnetic field at a specified point.
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Abbe Theory
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The visibility of an object under the microscope is directly proportional to the wavelength of light, and inversely to the aperture of lens.
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Depth
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The word alone generally denotes vertical depth below the surface. In the case of incline shafts and boreholes, it may mean the distance reached from the beginning of the shaft or hole, the borehole depth, or inclined depth.
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Ullrich Magnetic Separators
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These machines have powerful electromagnets in a wedge section. The material is treated on rolls on which magnetism is induced; they consist of alternate disks of soft iron and some nonmagnetic material. The ore is fed over the first roll, which removes the most magnetic material, and the tailings go on to the second, which is weaker, where a second separation is made.
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Raggy Stone
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Thin-bedded or flaggy sandstone.
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Lyway
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This term is commonly used in and around mines in Indiana and Illinois to describe a mine sidetrack or a passing track.
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Vanadium Minerals
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Those most exploited for industrial use are patronite (MoS2 with vandium sulfide) , roscoelite (vanadium mica), vanadinite, carnotite, and chlorovanadinite. Metal is silvery and whitish; melting point is 1,720 degrees C; used in high-speed steels and shock-resistant alloys, chemicals, ceramics, and textiles.
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Fence Diagram
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Three or more geologic sections showing the relationship of wells to subsurface formations. The scales diminish with distance from the foreground to give proper perspective. When several sections are used together, they form a fencelike enclosure, hence the name. Similar in some respect to a block diagram, but it has the advantage of transparency, which is not possible in a block diagram.
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Rrack Back
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To move a drilling machine away from the borehole collar by sliding it on its base, using the rack-and-gear pinion to facilitate moving the machine.
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Salable Coal
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Total coal mine output less tonnage rejected or consumed during preparation for market.
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