See:gyrocompass
A rule of thumb for estimating the depth of a magnetic body, which is
valid if the body may be regarded as magnetically equivalent to a single
pole. The depth of such a pole is equal to the horizontal distance from
the point of maximum vertical magnetic intensity to the points where the
intensity is one-third of the maximum value. AGI
See:scraper box plow
A muffle furnace of the McDougall type, in which the hearths are separated
by suitable flues through which the products of combustion from the
fireplace pass.
A system of shaft sinking through loose ground or quicksand by piles in
the form of iron tubes connected together by webs. Their downward movement
is facilitated by water under pressure that is forced down the tubes to
wash away the loose material from underneath their points. Nelson
a. A general term for the outward appearance of a mineral or rock.
AGI
b. The characteristic or typical crystal form, combination of forms, or
other shape of a mineral, including irregularities.
One of a series of short, straight, evenly spaced, parallel lines used on
a topographic map for shading and for indicating surfaces in relief (such
as steepness of slopes), drawn perpendicular to the contour lines.
Hachures are short, broad (heavy), and close together for a steep slope,
and long, narrow (light), and widely spaced for a gentle slope, and they
enable minor details to be shown but do not indicate elevations above sea
level. Etymol: French. Syn:hatching; hatchure. v. To shade with or show
by hachures. AGI
A map that represents the topographic relief by means of hachures.
A hammer resembling an adz, used in dressing stone. Webster 3rd
A miner's pickax or hack. A chisel or similar tool for cutting metal, as
wire, into nails. Fay
The property shown by certain minerals or rocks of fracturing or breaking
along jagged surfaces, e.g., broken iron.
A mineral's habit of breaking along jagged, irregular surfaces with sharp
edges. Leet, 1
A sulfur-rich variety of sodalite.
Irregular, saw-shaped terminations of crystals (such as of augite) or
grains due to intrastratal solution.
The complement of the dip; the angle that a structural surface makes with
the vertical, measured perpendicular to the strike. It is little used.
See also:dip; rise. Syn:underlay
AGI
Early form of autogenous grinding mill, in which comminution resulted from
the fall of ore on ore during the rotation of a large-diameter horizontal
cylinder. Pryor, 3
Haenisch and Schroeder process
A method for the recovery of sulfur as liquid sulfurous anhydride from
furnace gases. Fay
A compound analogous to zircon, therefore, the suggested name hafnon. It
can be synthesized from the oxides at 1,550 degrees C. Thermal expansion
(150 to 1,300 degrees C), 3.6 X 10-6 . Dodd
Special refractory compositions have been made by sintering mixtures of
HfO2 and TiO2 in various proportions. The melting point of
these sintered bodies was approx. 2,200 degrees C; there appeared to be a
phase change at about 1,850 degrees C. Some of the compositions had
negative thermal expansions. Dodd
a. To cut as with an ax; to cut down the coal with the pick. Fay
b. Scot. A cut; a notch. Fay
c. N. of Eng. A quagmire or pit in mossy ground; any broken ground in a
bog. Fay
A monoclinic mineral, V2 O2 (OH)3 ; forms black
crystals in sandstone, Wyoming.