Improvements in the Arrangement and Construction of Steam and Pressure Gauges.
Year: 1891

page_text: Date of Application, 25th May, 1891
Complete Specification Left, 25th Mar., 1892-Accepted, 21st May, 1892
PROVISIONAL SPECIFICATION.
Improvements in the Arrangement and Construction of Steam and
Pressure Gauges.
WILLIAM HENRY THOMPSON, Engineer ALEXANDER WILLIAMSON RAMSAY
Engineer ROBERT THOMPSON Engineer 155 Fenchurch Street London do hereby
declare the nature of this invention to be as follows:-
The object of our invention is improved arrangement of steam or pressure gauges
whereby they may be more readily or accurately read the movements or working
parts rendered more effective and easy of access.
In carrying our invention into practice we arrange the dial with two index lines
or circles one inside the other (hereinafter called the inner and outer index) the
outer index is marked for indicating the units and the inner index is marked with
the numerators or figures for indicating the higher pressures each index is traversed
by a seperate index hand the two index hands being operated by the movement of
the diaphragm or spring tube which radiates a segment rack gearing into and
working a pinion fixed on the tube carrying the inner index hand turning it in such
a manner as to cause the said hand to traverse the inuer index with a movement
according to the pressure acting on the diaphragm or spring tube..
The aforesd. tube carrying the immer index hand is fitted with another pinion or
wheel gearing into a pinion fixed on a spindle (hereinafter termed intermediate
spindle) employed for transmitting the required movement to the spindle carrying
the outer index hand which last mentioned spindle passes through and works in the
tube carrying the inner index hand so that both hands work from one centre the
spindle carrying the outer index band having the required movement imparted to it
by means of its being fitted with a pinion gearing into a wheel on the intermediate
spindle which spindle is the medium by which the two index hands are moved in
proper relation to each other (according to the dimensions of the gearing operating
them) by the movement of the diaphragm or spring tube which tube may be formed
with one or more turns in the form of a spiral and connected with the tube carrying
the inner index hand turning it by means of the extending or uncoiling action of
such diaphragm or spring tube when subject to the steam pressure, or two of such
diaphragm tubes may be employed one connected with the spindle carrying the outer
index hand and one connected with the tube carrying the inner index hand both
arranged to act in proper relation to each other of the gearing and the index hands
may be operated by two diaphragm tubes arranged to work in proper relation to
each other one tube operating a quadrant or segment rack gearing into a pinion on
the tube carrying the inner index hand and the other operating a segment rack
gearing into a pinion on the spindle carrying the outer hand. Instead of having
both index on one dial two dials may be employed one marked with the numerators
or higher figures and one with the units each of the index hands working from the
centre of each dial and operated in proper relation by suitably dimensioned inter-
mediate gearing working or gearing into the pinions on the spindles carrying the
index hands such spindles receiving motion from the movement of the diaphragm
or spring tube by the medium of a modification of the mechanism herein described.
Instead of employing dial or index cards the index may be shown on the face or
glass of the casing by affixing on its surface suitable figures or signs.
The face or front of the casing may be arranged so as to be moveable and fitted
with suitable hinges or fastenings.
WM. H. THOMPSON.
ALEXANDER WILLIAMSON RAMSAY.
ROBERT THOMPSON.

page_text: COMPLETE SPECIFICATION.
Improvements in the Arrangement and Construction of Steam and
Pressure Gauges.
WILLIAM HENRY THOMPSON ALEXANDER WILLIAMSON RAMSAY ROBERT
THOMPSON Engineers 155 Fenchurch Street London E.C. do hereby declare
the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:—
The object of our invention is improved arrangement of steam or pressure gauges
whereby they may be more readily or accurately read, the movements or working
parts rendered more effective and easy of access.
In carrying our invention into practice we arrange the dial with two index lines
or circles one inside the other (hereinafter called the inner and outer index) the
outer index is marked for indicating the units and the inner index is marked with
the numerators or figures for indicating the higher pressure. Each index is
traversed by a seperate index hand the two index hands being operated by the
movement of the diaphragm or spring tube which radiates a segment rack gearing
into and working a pinion fixed on the tube carrying the inner index hand turning
it in such a manner as to cause the said hand to traverse the inner index with a
movement according to the pressure acting on the diaphragmn or spring tube. The
aforesaid tube carrying the inner index hand is fitted with another pinion or wheel
gearing into a pinion fixed on a spindle (hereinafter termed intermediate spindle)
employed for transmitting the required movement to the spindle carrying the outer
index hand which last mentioned spindle passes through and works in the tube
carrying the inner index hand so that both hands work from one centre, the spindle
carrying the outer index hand having the required movement imparted to it by
means of it being fitted with a pinion gearing into a wheel on the intermediate
spindle which spindle is the medium by which the two index hands are moved in
proper relation to each other (according to the dimensions of the gearing operating
them) by the movement of the diaphragm or spring tube.
The face or front of the casing may be arranged so as to be moveable and fitted
with suitable hinges or fastenings.
DESCRIPTION OF DRAWINGS.
Fig. 1. shews front view of gange with central portion of dial plate Z. removed to
shew the gear for operating the hands or pointers G. and O.
Fig. 2. shews end view of same also cut away for the same purpose.
In this example the inner index is set off in equal devisions indicated by
denomintal figures, numerals or figures denoting the pressure at various heights
and the outer into units or fractional parts of one of such devisions but the order
may be reversed without in any way altering the principal. The steam or fluid
pressure entering the spring tube B. at the cock A. operates the radial segment C.
from the fixed point D. working the pinion E. on the tube or hollow spindle F.
which carries the inner radial index hand G. traversing the inner index H. on the
dial plate Z. from zero to 200 and embraces th of the circumference of the circle.
On the tube or hollow spindle is the wheel I. gearing, into the pinion J. working on
the intermediate spindle K. on the back end of which is the wheel L. gearing into
the pinion M. fixed on the spindle N. passing through the hollow spindle F. and
thus working both hands from the common centre of the dial plate Z. on the
spindle N. is fixed the revolving index hand O. which revolves around the outer
index P. shewing the units or fractional divisions between any two figures of the
inner circle divisions, passing the index hand G. as many times as there are divisions
shewn on the inner index H.

page_text: We would remark that we are aware that suplementary hands and indexs have
been employed for shewing in various ways, indications when the working or normal
pressure has been exceeded and from which our invention differs inasmuch that in
our arrangement and operation of the index hands they are geared up in such
relation to each other that one complete revolution of one hand is made for every
radial, from figure to figure movement of the other hand thus in the example
shewn admits of indicating pressure up to 200 lbs. per square inch a higher or lower
may be used-thus making 22 equal divisions of the circle and assuming that each
division is an inch apart the outer hand traverses its index and passes the inner
hand 20 times during the time the inner hand radiates from zero to the 200 lb. the
proportion in this case being for the hands 10 to 1 for the speeds 22 to 1.
Any modified form of spring tube or diaphragm may be employed for imparting
the necessary movement to the mechanism working the index hands.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, we declare that what we
claim is :-
==
The arrangement and operation of the inner and outer index hands in such
relation to each other, that while they both work on or from one centre, one hand
revolves around the dial or unit index circle and passes the radiating hand as many
times as may be necessary to indicate the units or minor divisions of each of the
numerators or figures denoting the pressure at various heights indicated by the
radiation of the aforesaid radiating hand-And we further claim in combination
with the index hands as aforesaid the employment of a dial or index in which the
spaces between the aforesaid numerators or figures denoting the pressure at various
heights are open or blank, instead of being marked or crowded with units or minor
divisions as in the ordinary manner, such units or divisions being represented by a
second index circle the circumference of which is equally divided into as many
units or minor divisions as would have been required in the ordinary way for
dividing one of the aforesaid spaces each of which are divided by the revolving hand
passing over the units index when the gauge is in operation substantially as and for
the purpose herein described and shown by Figs. 1 and 2. of the drawing hereto
annexed.
Lastly. We claim the improved arrangement and combination of mechanism and
parts for indicating pressure, substantially as and for the purpose herein described
and shown by Figs. 1. and 2. of the drawing hereto annexed.
1 Bel 1000
WM. H. THOMPSON.
ALEXANDER WILLIAMSON RAMSAY.
ROBT. THOMPSON.