Gr. Brit. A map of the mine workings, and sections of the shafts and seams
being worked, which the colliery manager must keep at the pithead office
in accordance with the Surveyors and Plans Regulations, 1956, of the Act.
Nelson
These are properties only of solutions and include vapor pressure,
freezing point, boiling point, and osmotic pressure changes that occur
with changes in the characteristics of the solution. Seawater does not
follow the general rules of solutions, but departures are proportional.
Hy
See:fiducial mark
a. Alignment axially of parts of an optical system. Collimation error is
due to the line of sight of a survey instrument not coinciding with
traversing gear, scales, or leveling devices. The collimation line is the
line of sight, passing through the intersection of the crosshairs of the
reticule. The collimation method is the height-of-instrument method of
leveling whereby fore-and-aft readings are made on a leveling staff by an
instrument placed intermediately so that the rise or fall between the fore
station and the back station is shown by a change in the staff reading.
See also:rise and fall
b. Conversion of a divergent beam of energy or particles into a parallel
beam. ASM, 1
The line of sight of a surveying instrument that passes through the
intersection of the cross hairs in the reticule. Hammond
A maceral of coal within the vitrinite group, consisting of homogeneous
jellified and precipitated plant material, lacking cell structure and of
middle-range reflectance under normal reflected-light microscopy.
See also:vitrinite
A triclinic mineral, Ca2 (Mg,Fe)(PO4 )2 .2H2 O;
fairfieldite group; forms fibrous nodules.
Blasting in which different sections of the rocks are blasted out against
each other. Langefors
Two waves that are propagated in opposite directions through the burned
gases, and originating at the point where two explosion waves meet.
Another name for euvitrain. See also:collain
Said of the rounded, finely banded kidneylike mineral texture formed by
ultra-fine-grained rhythmic precipitation once thought to denote
deposition of colloids. CF:botryoidal; reniform. AGI
A substance composed of extremely small particles, ranging from 0.2 to
0.005 mu m, which when mixed with a liquid will not settle, but remain
permanently suspended; the colloidal suspension thus formed has properties
that are quite different from those of the simple, solid-liquid mixture or
a solution.
A clay, such as bentonite, which, when mixed with water, forms a
gelatinous-like liquid. Long
A mixture of finely pulverized coal and fuel oil, which remains
homogeneous in storage. It has a high calorific value and is used in
oil-fired boilers as a substitute for fuel oil alone. Nelson
A drilling mud in which the gelatinous constituents, such as bentonite,
will remain in suspension in water for a long time. Long
Particles so small that their surface activity has an appreciable
influence on the properties of its aggregate. ASCE
Amorphous sulfur in a finely divided condition. Prepared by the action of
dilute sulfuric acid on sodium thiosulfate or by the reaction of hydrogen
sulfide and sulfurous acid. Also prepared by mixing equivalent solutions
of hydrogen sulfide and sulfur dioxide. Forms a clear yellow solution
containing very minute suspended particles of sulfur; the addition of alum
immediately precipitates the sulfur. Also called milk of sulfur.
Cooper
Grinding appliance such as two disks set close and rotating rapidly in
opposite directions, so as to shear or emulsify material passed between
them. Pryor, 1
Minerals deposited as gradually hardening gelatinous or flocculent masses
instead of assuming crystalline form; may apply to some deposits of
malachite, hematite, and psilomelane. CF:botryoidal; reniform.
Generic designation for massive, amorphous, cryptocrystalline to
fine-grained apatite or phosphate that constitutes the bulk of phosphate
rock and fossil bone; not a true mineral species; analogous to the terms
limonite and bauxite. Syn:collophanite
See:collophane