Improvements in Pressure and Vacuum Gauges.
Year: 1887

page_text: Date of Application, 19th Dec., 1887
Complete Specification Left, 19th Sept., 1888
Complete Specification Accepted, 26th Oct., 1888
PROVISIONAL SPECIFICATION.
Improvements in Pressure and Vacuum Gauges.
1, THOMAS STRUTHERS MINNES of 8 Buchanan Street, Glasgow in the County of
Lanark, Watchmaker, do hereby declare the nature of this invention to be as
follows:-
:-
This Invention which relates to improvements in pressure, and vacuum gauges
has for its object to construct the gauge with two separate and distinct indicating
movements the one movement being a check upon the other. In carrying out the
invention two indicating tubes of the full size employed in such gauges are used, both
of the said tubes being of common construction but having their ends, to which the
toothed quadrants working the fingers or pointers are geared, turned in opposite
directions whilst their other ends are connected to two branches made in the nipple
of the gauge casing or to two separate nipples the pressure or vacuum being applied
through the said nipple or nipples in the usual way. One of the indicating fingers or
pointers is situated upon a solid spindle whilst the spindle of the other is tubular and
placed sleevewise over the solid spindle and both spindles have spur pinions upon them
by which they are geared to the quadrants connected to the free ends of the
pressure or vacuum tubes. The dial of the gauge is divided off from its highest
or other point in equal indications of pressure or vacuum that is to say if the first
indication to the right is 10 pounds the first indication to the left is also 10 pounds
and so on and in giving an indication the fingers or pointers move in opposite
directions.
1007
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: апи vacuum Gauges.
I, THOMAS STRUTHERS MINNES of 8 Buchanan Street, Glasgow, in the County of
Lanark, Watchmaker, 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 :-
This invention which relates to improvements in pressure and vacuum gauges has
for its object to construct the gauge with two separate and distinct indicating move-
ments the one movement being a check upon the other. In carrying out the invention
as represented in the accompanying drawings in elevation at figure 1 and in vertical
section at figure 2 two indicating tubes A and B of the full size employed in such
gauges are used both of the said tubes being of common construction but having
their ends a, b, to which the toothed quadrants C and D working the fingers or
pointers E, F, are geared, turned in opposite directions whilst their other ends are
connected to two branches made in the nipple G of the gauge casing or to two
separate nipples, the pressure or vacuum being applied through the said nipple or
nipples in the usual way. One of the indicating fingers or pointers E is situated upon
a solid spindle e whilst the spindle of the other is tubular and placed sleevewise over
the solid spindle and both spindles have spur pinions c and d upon them by which
they are geared to the quadrants C, D, connected to the free ends of the pressure or
vacuum tubes A, B. The dial of the gauge is divided off from its highest or other
point in equal indications of pressure or vacuum that is to say, if the first indication
to the right is 10 pounds the first indication to the left is also ten pounds and so on
and in giving an indication the fingers or pointers move in opposite directions.
In a modification illustrated in elevation at figure 3 both tubes are turned in the
same direction the one being placed behind the other; and they are connected to two
quadrants (of which one only is visible) gearing into pinions c¹ one on a solid
spindle and the other on a hollow spindle, the pointers E being connected thereto
as in the modification first described but travelling in the same direction over the dial
which is divided in the usual way.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is
A double tube pressure or vacuum gauge constructed substantially as hereinbefore
described.