Drilling to test subsoil and rocks when considering foundations of
buildings, dams, and heavy plant. Pryor, 3
As used by foundation engineers, the act or process of sinking holes into
the overburden (sometimes to considerable depth into bedrock) with rotary
or drive sampling equipment for the purpose of recovering samples from
which information on the physical characteristics of the materials
penetrated can be obtained; also applied to the sample or samples so
obtained. Syn:borehole; drill hole; drilling. Long
Core removed from a concrete structure by diamond core drilling and tested
in a laboratory to determine the strength and other physical properties of
the concrete. Also, core removed from a borehole drilled in search of oil
and used to determine the porosity of the core and whether oil is present.
Long
An instantaneous detonator that has a strength equivalent to that of a
detonator with a base charge of 0.40 to 0.45 g PETN. CFR, 4
a. A sampling instrument. Nelson
b. A person responsible for carrying out ventilation, dust, or other
tests. Nelson
c. Service company representative who supervises borehole testing
operations. Wheeler, R.R.
a. Generally, any borehole drilled to obtain samples whereby the
structural and physical characteristics of the rocks penetrated can be
determined; more specif., a hole produced by rotary or driving
soil-testing tools in the course of obtaining samples used in soil- and
foundation-testing work. Long
b. Usually a small hole drilled ahead and flanking in a working place to
ascertain proximity of old workings and to determine water or air content
of same. BCI
c. A drill hole or shallow excavation for testing an orebody; a test pit.
Fay
d. A taphole, as in a cementation furnace. Standard, 2
See:bedrock test
The lowered flame of a miner's flame safety lamp, which is used to detect
the presence of small percentages of combustible gases in mine air.
Nelson
A machine used for applying test loads to standard test pieces or to
structural members. Machines are available for carrying out tensile,
compressive, impact, and fatigue tests. Hammond
Lead free from any silver, and often finely granulated; used in testing or
cupelling, assaying, etc. Webster 3rd
Paper (as litmus paper) cut usually in strips and saturated with an
indicator or other reagent that changes color in testing for various
substances. Webster 3rd
A piece of material prepared in a suitable shape so that it can be tested
in a testing machine. Hammond
a. A shallow shaft or excavation made to determine the existence, extent,
or grade of a mineral deposit, or to determine the fitness of an area for
engineering works, such as buildings or bridges. Stokes
b. See:test hole; trial pit.
An oval iron frame for holding a test or movable cupelling hearth.
Fay
Basanite. Used for testing streak of precious metals.
Said of a point group or of specific crystal forms in the isometric and
tetragonal crystal systems that have but one-fourth the crystal faces
generated for the equivalent crystal form in the holohedral (most
symmetric) crystal class. These complimentary merohedral forms are
designated plus or minus and left or right, four forms being required to
show all the faces of the holohedral form because each form lacks both a
center and mirror planes of symmetry. See also:merohedral
See:boron carbide
A crystallographic axis of rotation of 90 degrees , four-fold.
CF:axis of symmetry
a. A trigonal mineral, Bi2 Te2 S ; forms foliated masses in
auriferous veins, commonly with tellurobismuthite; a source of bismuth.
Syn:telluric bismuth; bismuth telluride.
b. The mineral group kawazulite, paraguanajuatite, skippenite,
tellurantimony, tellurobismuthite, and tetradymite.
An antiknock constituent of gasoline; Pb (C2 H5 )4 .
a. Designating or belonging to a system of crystallization having all
three axes at right angles and the two lateral axes equal. This system is
called tetragonal system. Fay
b. The crystal system in which crystals have one four-fold symmetry axis.
Hurlbut
c. The crystal system characterized by three orthogonal crystallographic
axes, the principal or c axis being a tetrad (4-fold axis), longer or
shorter than the two lateral a axes. See also:crystal systems