Improvements in Mining Surveying Instruments.
Year: 1898

page_text: Date of Application, 20th Apr., 1898
Complete Specification Left, 20th Feb., 1899-Accepted, 25th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements in Mining Surveying Instruments.
I, WILLIAM FORD STANLEY, of 4 and 5, Great Turnstile, Holborn, in the County
of London, Optician, do hereby declare the nature of this invention to be as
follows:
1
The object of my invention is to provide means in mining surveying instru-
ments for reading or sighting up or down shafts in a vertical line or for enabling
readings to be taken at any angle between horizontal and 90 degrees both ways.
Hitherto mining theodolites have been constructed to read in the zenith but
readings cannot be taken with them downwards correctly at a greater angle than
that which is formed from the centre of the trunnion carrying the telescope and
the edge of the limb of the instrument excepting by the addition of a second
telescope attached over or at the side of the ordinary telescope and mining dials or
circumfrentors will only read downwards or upwards as far as the angle formed
by the gimbal ring when depressed until it comes into contact with the parallel
plates and under centre work of the instrument. To carry my invention into
effect I construct my improvements as follows:-
For theodolites or mining dials of the ordinary construction I provide a special
reflector which fits upon the object end of the telescope it is made as follows. A
tube is made to fit exactly over the enlarged object end of the telescope and to ensure
this keeping in its exact position a slot is formed in the end which goes over the
object end and upon the telescope a projection is fixed to engage this slot. Upon
the top of this tube a fitting is attached preferably by pushing and pulling screws
to allow of adjustment this fitting has a bar which projects over the front and down
at an angle of 45 degrees under this bar at its upper part a hinge is formed which
carries a plate and this plate comes down parallel to the bar.
Through the lower end of the bar an adjusting screw is fitted which engages
the plate so that by turning the adjusting screw the angle of the plate can be
varied.
Upon the side of the plate facing the object glass of the telescope I affix a plane
mirror and when this mirror is adjusted to exactly 45 degrees the telescope will
read exactly 90 degrees from its line of collimation. In mining dials of new
construction instead of making the gimbal ring straight as in all dials at present
I construct a cranked gimbal ring which is pivoted upon trunnions in the usual
way. The gimbal is cranked upwards both ways from the trunnion bearings
sufficiently for it to clear all the under work of the instrument when it is moved
through 90 degrees of arc. The Y's which carry the telescope are made shorter
than usual as the cranking up of the gimbal makes up for part of the height neces-
sary for carrying the telescope clear of the limb of the instrument.
Various modifications may be made and any suitable materials used.
0011 1...
A1 1900
H. T. TALLACK,
Agent for Applicant, 10, Great Turnstile, Holborn, London, W.C.

page_text: Improvements in Mining Surveying Instruments.
I, WILLIAM FORD STANLEY, of 4 and 5, Great Turnstile, Holborn, in the County
of London, Optician, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:―
The object of my invention is to provide means in mining surveying instru-
ments for reading or sighting up or down shafts in a vertical line or for enabling
readings to be taken at any angle between horizontal and 90 degrees both ways.
Hitherto mining theodolites have been constructed to read in the zenith but
readings cannot be taken with them downwards correctly at a greater angle than
that which is formed from the centre of the trunnion carrying the telescope and
the edge of the limb of the instrument excepting by the addition of a second
telescope attached over or at the side of the ordinary telescope, and mining dials or
circumferentors will only read downwards or upwards as far as the angle formed
by the gimbal ring when depressed until it comes into contact with the parallel
plates and under centre work of the instrument.
To carry my invention into effect I construct my improvements as follows, refer-
ence being made to the accompanying drawings.
For theodolites or mining dials of the ordinary construction I provide a special
reflector Fig. 1 which fits upon the object end of the telescope; it is made as follows.
A tube A, is made to fit exactly over the enlarged object end of the telescope 1,
and to ensure this keeping in its exact position a slot is formed in the end which
goes over the object end and upon the telescope a projection C, is fixed to engage
this slot. Upon the top of this tube a fitting D, is attached preferably by pushing
and pulling screws to allow of adjustment, this fitting has a bar E, which projects
over the front and down at an angle of 45 degrees under this bar at its upperpart
a hinge F, is formed which carries a plate G, and this plate comes down parallel
to the bar E. Through the lower end of the bar an adjusting screw H, is fitted
which engages the plate so that by turning the adjusting screw the angle of the
plate G, can be varied. Upon the side of the plate facing the object glass of the
telescope I affix a plane mirror I, and when this mirror is adjusted to exactly
45 degrees the telescope will read exactly 90 degrees from its line of collimation.
In mining dials of new construction instead of making the gimbal ring straight
as in all dials at present I construct a cranked gimbal Fig. 2 & 3 J, which is
pivoted upon trunions in the usual way. The gimbal is cranked upwards both
ways from the trunion bearings sufficiently for it to clear all the under work of the
instrument when it is moved through 90 degrees of arc. The Y's K, which carry
the telescope L, are made shorter than usual as the cranking up of the gimbal
makes up for part of the height necessary for carrying the telescope clear of the
limb M, of the instrument.
Fig. 2 represents a mining dial fitted with my improved cranked gimbal with
telescope horizontal and Fig. 3, the same instrument with telescope moved through
an are of 90 degrees downwards.
Any suitable materials may be used.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is
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1. The use in combination with telescopes used for surveying instruments of an
adjustable reflector for the purpose of taking readings at right angles from the

page_text: line of collimation of the telescope substantially as herein described and illustrated
in the accompanying drawings.
2. The use in combination with mining dials of a cranked gimbal ring so formed
as to allow of it clearing all the under work of the instrument throughout a move-
ment of 90 degrees from horizontal to vertical upwards or downwards substantially
as herein described and illustrated in the accompanying drawings.
Dated this 20th day of February 1899.
H. T. TALLACK,
Agent for Applicant, 10, Great Turnstile, Holborn, London, W.C.