Mineral-Prospecting Apparatus. Page: 3 of 3
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1,071,199
character of the formation. Where the
water from the cavities and veins in the
deposit is depended on, and where such water
contains impurities which contaminate the
5 samples, any error due to such coitamina-
tion may be corrected by stopping the drill
and elevating samples of water from the
veins and cavities and determining the
amount of impurities therein, so that the
10 effect of the water on the samples may be
determined.
My improved apparatus may be used for
prospecting for minerals of various kinds.
I have found it particularly useful in pros-
15 pecting for deposits of sulfur which oc-
curred in a stratum from 700 to 800 feet
below the surface of the ground, full of
cavities and crevices and permeated by im-
pure water.
20 Having now described my invention, what
I claim is:,
1. In an apparatus of the-kind described,
the combination with a bit, of a double drill
stem connected therewith formed of two
25 concentric pipes, and means for forcing air
down through the outer and into the inner
pipe, the inner pipe having its open lower
end disposed to receive the material re-
moved by the bit, substantially as described.
30 2. In an apparatus of the kind described,
the combination with a hollow core-cutting
bit, of a double drill stem connected there-
with formed of two concentric pipes, the
inner pipe having its open lower end dis-
35 posed to receive the. core removed by the
bit and having air passages formed in its
wall above the bit, and means for forcing
air down the outer pipe and through said
passages, for the purpose described.
40 3. Apparatus of the kind described, com-
prising a bit with a hollow drill stem con-
nected therewith, and an inner pipe having,
an unobstructed interior, and means for de-
livering air into the said inner pipe inter-
45 mediate its ends, for the purpose described.
4. Apparatus of the kind described, com-
prising a hollow core-cutting bit with a
hollow drill stem connected therewith, and-
an inner pipe having an unobstructed in-terror, and means for delivering air into 50
said inner pipe near its lower end above
said bit, substantially as described.
5. In apparatus of the kind described, a
double drill stem comprising concentric
outer and inner pipes, with an air space be- 55
tween their walls, a hollow core cutting bit
fixed to said stem, a T mounted on said
outer pipe near its upper end, so as to per-
mit the rotation of the pipe with respect to
the T, means for rotating said stem, and 60
means for forcing air into said T and
through said air space and into said inner
pipe substantially as described.
6. In apparatus of the kind described, a
double drill stem, comprising concentric 65
outer and inner pipes with an air space be-
tween their walls, a hollow core cutting bit
fixed to said stem, a discharge conduit and
a joint connecting said conduit with' said
inner pipe and arranged to permit relative 70
rotation of the two, a T mounted on said
outer pipe near its upper end, so as to per-
mit the rotation of the pipe with respect
to the T, means for rotating said stem, and
means for forcing air into said T and 75
through said air space and into said inner
pipe substantially as described.
7. Apparatus of the kind described com-
prising a well casing, means 'for forcing
water therein, a double drill stem located 80
in said casing, and comprising concentric
outer and inner pipes with an air space be-
tween their walls, a hollow core cutting bit
fixed to said stem, a discharge conduit and
a joint connecting said conduit with said 85
inner pipe and arranged to permit relative
rotation of the two, a T mounted on said.
outer pipe near its upper end, so as to per-
mit the rotation of the pipe with respect to
the T, means for rotating said stem, and 90
means for forcing air into said T and
through said air space and into said inner
pipe substantially as described.
BENJAMIN ANDREWS.
Witnesses:
L. A. CORLTON,
Go. 0. Scoi'r.2
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Andrews, Benjamin. Mineral-Prospecting Apparatus., patent, August 26, 1913; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth853742/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.