IMPROVEMENTS IN DRY GAS METERS
Year: 1874

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," Southampton Buildings, London, Doctor of Laws, for the.
Invention of "IMPROVEMENTS IN DRY GAS METERS."—A communication
from abroad by Thomas C. Hopper, of Philadelphia, Pennsylvania,
United States of America, Gas Meter Manufacturer.
COMPLETE SPECIFICATION filed by the said George Haseltine at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 5th March 1874, pursuant to the 9th Section
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HASELTINE, of the "International Patent Office," Southampton
Buildings, London, Doctor of Laws, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN DRY GAS METERS," and have petitioned Her Majesty to grant unto

page_text: me, my executors, administrators, and assigns, Her Royal Letters Patent
for the same, and have made solemn Declaration that it has been com-
municated to me from abroad by Thomas C. Hopper, of Philadelphia,
Pennsylvania, United States of America, Gas Meter Manufacturer.
NOW KNOW YE, that I, the said George Haseltine, do hereby declare
that the following Complete Specification, under my hand and seal, fully
describes and ascertains the nature of the said Invention, and in what
manner the same is to be performed in and by the following state-
ment, reference being had to the accompanying Drawing forming a part
of this Specification :-
The object of this Invention is to increase the working capacity of
dry gas meters to nearly double that heretofore afforded, and to make
this increase of working capacity at comparatively trifling cost in
material; these advantages I produce, by the arrangement and com-
bination of a plurality of moving discs instead of one as heretofore for
cach bellows as will be herein-after set forth and described.
The
As this Invention relates more especially to the so called "Glover
meter," my improvements will be more readily understood; and
appreciated by a brief reference in the first place to certain peculiarities
in the construction and operation of the bellows in the said meter.
"Glover meter" consists of a sheet metal case the lower portion of
which is divided into two like compartments by a vertical partition;
secured in each of these two like compartments is a bellows consisting
of one moving disc or diaphragm of tin plate provided with a ring which
projects inward from its perimeter, and to which ring one side edge of a
flexible leather band is secured; the opposite side edge of the said
leather band is secured in like manner to another like sheet-metal ring
permanently soldered fast to the partition which as before stated divides
the bellows portion of the meter into two compartments. The moving
disc is supported upon the usual flag staff so as to move inward and
outward alternately from the pressure of the gas and thus give motion
to the flag staff and its connecting valves and register...
It will be seen that as the disc can move only through a prescribed
space limited in its inward motion by the projecting ring on the partition
there is necessarily left a useless space equal in depth to the width of

page_text: is confined to the shallow space left between said ring and the flag
staff.
I will now proceed to describe my Invention with reference to the
accompanying Drawing, in which Figure 1 is a vertical central section
at right angles to the partition which divides the said case into the two
compartments for the respective bellows; Figure 2 is a horizontal section
below the dotted line V, W, Figure 1.
Figure 3 is a front elevation of the outer disc and leather band of one
of the bellows of the meter in connection with its flag staff.
5
A is that portion of the case which is divided into two equal inter-
communicating compartments for the two bellows by the partition a¹;
B and B are two moving discs of the two respective bellows; C and C¹
are the respective leather bands which connect the two respective
discs of each bellows and an intermediate ring D or D¹; E is a
pair of equal armed levers which vibrate on a cross bar e¹ as their
common fulcrum, the said bar passing diametrically across the ring D.
or D¹, and through it horizontally into the opposite side of the case,
where it is permanently fixed; e", e", are four connecting rods or bars
which are articulated respectively to the four ends of the pair of
levers E, and to the discs B and B¹ of each bellows, one end of each
lever being connected to one disc and the other end to the opposite disc.
of its respective bellows, so as to maintain a vertical parallelism of the
two moving discs as the gas passes through the meter. The outer disc
of each bellows is supported as heretofore upon its flag staff F, F, and the
inner one is supported by a swinging barf attached by a joint to the
partition a¹ or to the top of the case, so that it may swing freely and
support the disc. As there are two moving discs B, B¹, in each of the
two compartments of the meter, the depth of each of the said compart-
ments is necessarily made about one-fifth greater than the depth of the
aforesaid so-called "Glover meter" of the same size, and this slight
increase of the depth is all the increase required in the comparative size
of the case, because by dispensing with the ring which is attached
to the partition in the "Glover meter "I utilize the space which the
width of the said ring rendered useless, thus with the additional space.
obtained by adding about one-fifth to the depth of the compartment for.

page_text: each bellows, as above stated, I obtain ample space for the backward
and forward movements of both of the moving discs B or B¹ of my
improved meter, or in other words I obtain double the working capacity
obtainable by the "Glover meter" of nearly the same size of case. The
port G is one of two channels through which the gas enters and passes
out alternately to and from the interiors respectively of the two bellows;
it extends from its valve down through the top of the case and through
the middle ring D of the respective bellows and thus operates between
the two moving discs of the same. It will therefore be evident that by
this Invention the "Glover meter" is increased in working capacity to
nearly double its former ability at comparatively a very small increase
in size and in the cost of construction and material used, because at each
pulsation or vibration of each or either of my double disc bellows a
definite quantity of gas will pass through the meter exactly in proportion
to the areas of the two moving discs B or B¹, the leather bands C or Ct.
in part, and the distance travelled or length of stroke. The two discs of
either bellows being closed together, as shewn by B' in Figures 1 and 2,
the 'action of the gas upon them will be as follows, viz., the gas passing
-inward through the port G acts on the inner side of the two discs B¹, B¹,
and causes each to move outward from its former position about three-
fourths of an inch, and this motion is communicated through the
flag staff arms and other parts to the valve, thus opening the opposite
port of the valve, and through a channel admitting gas to the outer side
of the two discs B, B, causing them to move toward each other or back
to their former position, which was precisely like that represented by B¹,
or in other words the gas passing through one port of the valve is caused
to so act on two discs as to cause them to move at one and the same
time, and thus give double the extent of the motion that is effected by
the bellows in the "Glover meter," and consequently pass double the
amount of gas at each pulsation or vibration of the bellows. By the
addition of an extra valve or channel to each, any desirable number of
such double disc bellows may be used in one compartment, thus
securing the largest amount of work from a given space and also
economising the material used.

page_text: having two moving discs B or B¹ operating in respective apartments,
substantially as described.
In witness whereof, I, the said George Haseltine, have here-
unto set my hand and seal, this Fifth day of March, in the
year of our Lord One thousand eight hundred and seventy-
four.
Witness,
W. ROBT. LAKE.
GEORGE HASELTINE. (L.S.)