A New or Improved Adjustable Scribing Gauge.
Year: 1889

page_text: Date of Application, 2nd Feb., 1889
Complete Specification Left, 2nd Nov., 1889-Accepted, 28th Dec., 1889
PROVISIONAL SPECIFICATION.
A New or Improved Adjustable Scribing Gauge.
I ANDREW MUIR of No. 2 Walbrook in the City of London, Engineer, (a com-
munication to me from abroad, by Pierre Philipp Huré, of 8 Fontaine au Roi Paris,
France, Merchant,) do hereby declare the nature of this invention to be as follows :—
This Invention relates to an adjustable Scribing Guage actuated by tangent
screw and wheel and has for its object to obtain a greater precision and sensibility
than heretofore obtained and consists in a toothed sector point bearer, oscillating
on a pivot; this toothed sector is worked upon by an endless screw which is turned
with the assistance of another screw.
A socket slides vertically on a shaft and fixes itself there at the desired point by
means of a third screw which presses upon a spring key.
A fourth screw serves to fix the sector, and a fifth to maintain the tracing point.
The support of the endless screw, is provided with a ruling screw which allows of its
being brought near to the toothed sector, and of ruling it with all the precision
required; and a button mounted with a smooth rubbing, on a square, fixed upon the
axle of the tangent screw, is regulated in its turn by a thumb screw. A steel filing
chased in to form a spring placed between the seat of the afore mentioned button
and the support, assures a very gentle rubbing, and prevents friction and wear.
The working of my new or improved adjustable scribing gauge is as follows:-
The socket being placed approximately at the height required, it turns the button
either to the right or to the left, to raise or lower the tracing point, the displacement
of which is at will either very great or very small, according to the button being
turned either more or less.
The sensibility and the facility of working are such that the tracing point can be
instantly regulated with an absolute precision.
HUGHES & SON,
5, Chancery Lane, London, W.C., Agents.
Unancery Lane, Dondon, ¥•♥• Agents.
COMPLETE SPECIFICATION.
A New or Improved Adjustable Scribing Gauge.
I ANDREW MUIR, of 2 Walbrook, in the City of London, Engineer (a com-
munication from Pierre Philipp Huré, of 8 Rue Fontaine au Roi, Paris, Merchant),
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:-
My invention relates to a new or improved adjustable scribing gauge, and has for
its object a scribing gauge that shall be novel in construction, and at same time be
easy of adjustment, and maintain the precision and sensibility necessary to obtain
good results.
And in order that my invention may be more readily understood, I have shewn
same on the accompanying drawing.
A sector point bearer A oscillates on a pivot B. This toothed sector gears with
an endless screw C which is turned by a button D. The socket G slides vertically on
the stem H, and is fixed at the desired point, by means of the screw F which presses
upon a Spring Key I.
The screw E serves to fix the Sector and the screw K to maintain the tracing
point.

page_text: The support L of the endless screw is provided with an adjusting screw which
allows of its being brought near to the toothed sector and of adjusting it with all the
precision required; and the button D, mounted with an adjustment on a square, fixed
upon the axle of the tangent screw which gives a slight friction and is regulated in
its turn by a thumbscrew. A steel spring washer is placed between the seat of the
button D and the support L, to reduce friction and prevent wear.
The socket G being placed approximately at the height required, the button D
is turned either to the right or to the left, to raise or to lower the Tracing Point; the
displacement of which, is at will, either very great or very small, according to the
button being turned either more or less.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The improved adjustable scribing gauge, actuated by a tangent screw and sector, as
herein before described and shewn, and for the purpose set forth.
Dated this 2nd day of November 1980
HUGHES & SON,
5, Chancery Lane, London, W.C., Agents for the Applicant.