AN IMPROVED METHOD OF AND APPARATUS FOR ASCERTAINING THE GRADIENT OF ANY INTERNAL OR EXTERNAL SURFACE, TOGETHER WITH THE MAGNETIC BEARING OF SUCH GRADIENT
Year: 1882

page_text: LETTERS PATENT to Peter Jensen, of 33, Chancery Lane, in the county of
Middlesex, for an Invention of "AN IMPROVED METHOD OF AND APPARATUS
FOR ASCERTAINING THE GRADIENT OF ANY INTERNAL OR EXTERNAL SURFACE,
TOGETHER WITH THE MAGNETIC BEARING OF SUCH GRADIENT."-A communi-
cation from abroad by Ebenezer Farie Macgeorge, of St. James' Park,
Hawthorn, near Melbourne, in the colony of Victoria, Gentleman.
COMPLETE SPECIFICATION filed by the said Peter Jensen at the Office
of the Commissioners of Patents on the 13th April 1882.
PETER JENSEN of 33 Chancery Lane in the County of Middlesex "AN
IMPROVED METHOD OF AND APPARATUS FOR ASCERTAINING THE GRADIENT OF ANY
INTERNAL OR EXTERNAL SURFACE TOGETHER WITH THE MAGNETIC BEARING OF
SUCH GRADIENT"
A communication from abroad by Ebenezer Farie Macgeorge
of St. James' Park, Hawthorn, near Melbourne in the Colony of Victoria
Gentleman
This invention consists of an improved method of and apparatus for ascertaining
the gradient of any internal or external surface together with the magnetic bearing
of such gradient, and is principally applicable to bore holes made in the earth.
When used in a diamond drill or artesian well-hole I fix to the boring end of the
drill a length of tubing say eight or ten feet, of as great a diameter as the bore
will conveniently admit. This is made of copper, brass, or other non-magnetic
metal, and must be strong enough to withstand any pressure of water that may
exist at the depth to be tested, and be securely plugged and capped at each end
for the same reason-Inside it I place one or more phials or tubes of clear glass
secured at top and bottom so as to contain a hot solution say of gelatine of a
proper strength, capable of congealing when cooled down to the temperature of the
position to be examined. These phials must accurately fit the copper or brass
tube already described so that their sides shall be parallel with the tube and the
Prine &1

page_text: drill rod, and they should be placed with spaces of nine inches or thereabouts
between them at intervals in the said tubo until it is filled; such spaces being filled
with heated bolts of copper, with hot water or oil, or with any slowly cooling
material so as to delay the congealing of the fluid in the phials until they are in
position in the bore to be tested. The fluid in the phials may be a hot solution of
gelatine, or it may be any other fluid hot or cold which will become solid, or of
firm consistency after the lapse of the time requisite to place the whole apparatus
in its destined position-A crystallizing solution would answer the purpose, inclted
sperm or wax or a chemical mixture either hot or cold, which has the property
of being at first fluid, and then after a time of becoming solid, or of firin
consistency.
Upon the surface of the fluid contents of each phial is placed a floating card of
wood, cork or hollow metal, with a magnetic neodio immovably attached to it, and
the card divided into the points of the compass or into degrees as thought
desirable.
When the apparatus above described is introduced into the position to be lasted
it should be allowed to remain a suflicient time for the fluid contents of the phials
to congeal or crystallize or become of firin consistency and then be withdrawn.
Taking out any one of the phials and supporting it on a levelled table in such a
position that the surface of the congealed fluid is in its natural and level position,
and the compass card so that the north point is towards the north the anglo which
the phial makes with the surface of the table will be the angle made with the lovel
line or surface of the earth by the phial when in the place where its contenta
congested and the direction in which the phial inclines is the inagnetic bearing of
the gradient tested. From theso data the exact deviation of any bore hole from
the initial direction may be exactly ascertained.
As an illustration of this invention Figure 1 of the accompanying drawinga
shows part of a bore hole containing such an apparatus. A is the non-maguetic
metal tubing. B the phials therein showing the position in which their contents
would solidify holding the compass card on the top. Figure 2 shows as an
example a deviating bore hole with a vertical and horizontal line indicating the
amount of deviation, which latter can be ascertained in the manner described.
Having thus described the nature of this invention and the manner of
performing same would have it understood that claim as the invention
communicated to me:
First: The improved method of ascertaining the gradient of any internal or
external surface together with the magnetic bearing of such gradient vis by means
of vessels containing a Quid which will solidify and also of a compass card and
needle floating on top of such fluid such vessels being conveyed to the position to
be tested, allowed to remain there until the fluid has ceased to be fluid, and then
withdrawn substantially as herein described and explained
Second: The apparatus herein described and illustrated for effecting this object.
In witness whereof 1 the said Peter Jensen have hereunto set my luind
and seal this Thirteenth day of April in the year of our Lord One
thousand eight hundred and eighty two: