Improvements in Apparatus for Weighing Gases.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Weighing Gases.
1, MAX ARNDT of Monheimsallee 49, Aix-la-Chapelle, Germany, Engineer,
do hereby declare the nature of this invention to be as follows:-
The gas weighing apparatus of this invention comprises an air tight casing in
which is enclosed a balance, from one of the ends of the scale beam of which
is suspended a hollow vessel so as to be able to move up and down within a
gas container. The other end of the scale beam has suspended from it in
ordinary air a globular weighted vessel to exactly balance the vessel in the gas
container when this is full of air. The gas to be weighed is conducted from outside
the airtight casing through a tube to the gas container and flows out of the latter
through another tube to the outside of the apparatus. To the middle of the scale
beam is fixed a long pointer the extremity of which when the scale beam oscillates
travels over a scale fixed upon the vertical standard of the balance so as to indicate
The gases
the difference between the weight of atmospheric air and the gas.
to be weighed may be drawn through the gas container by suction.
The air tight casing is provided with closeable apertures for the admission of
fresh air when necessary and also for the adjustment of the balance beam by the
addition or removal of weights. Fresh air is admitted to the casing to compensate
The
for any escape of the gas from the gas container to the surrounding air.
globular vessel suspended in the air space may also be enclosed within an air
container and the gas container instead of being placed within the casing may be
placed outside the same and may be shut off from the air space by means of a
liquid seal, the gas container discharging some of the gas through a bell shaped
vessel the bottom edge of which dips into a liquid, the gas before its discharge and
in order to weigh the same acting upon the hollow vessel within the gas container
which is provided with inlet and outlet pipes for the gas. The vibrations of the
hollow vessel are transmitted to the scale beam and pointer through a frame which
at the upper end is attached to the scale beam through a rod and at the bottom end
dips into the water seal and then rises upwards to engage the eye of a rod from
which the hollow vessel is suspended and which acted upon by the gas causes the
scale beam and pointer to vibrate. The weighted vessel in the air space may by
way of compensation also have one or more rods or frames working in liquid and
the several liquid containers may be in connection with one another by a pipe.
TL: och den of March 1895
CAPITAINE & VON HERTLING,
89 Chancery Lane, London, W.C., Agents for the Applicaut.

page_text: I, MAX ARNDT of Monheimsallee 49, Aix-la-Chapelle, Germany, Engineer,
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 gas weighing apparatus of this invention is shewn in the accompanying
drawing in which
Fig. 1, is a part sectional view of the gas balance enclosed in an air tight chamber
provided with one or more panes of glass.
Fig. 2 is a similar view of a modified form thereof.
Fig. 3 is a sectional view of an adjustable weighing or balancing device.
Figs. 4, 5, 6, 7, are sectional views on a smaller scale of various modified forms
of the gas balance.
a is a closed air tight chamber or case which may be furnished with one or more
panes of glass for the purpose of observing the gas balance. 6 the beam of a
balance placed within the case a. c, d, weighing or balancing bodies of any
suitable form in connection with the balance beam. e the air space in which
the weighing body c is suspended. f the gas vessel in which the weighing body d
is suspended from one end of the beam and through which vessel the gas to
be weighed is caused to pass in any suitable manner. c is an attachment for
adjusting or adding to the volume of the weighing body c.
The gas vesself is arranged either inside the case a (Figs. 1, 4, 5) or outside
the same (Figs. 2, 6, 7), also a special air container el enclosing the weighing
body c (Figs. 4, 7) may be provided in or adjacent to the case a.
The swinging parts of the gas balance are placed in equilibrium by the bowl or
tray g and small weights placed therein so that the pointer z shall point to zero
on the scale m when air is present in all parts of the apparatus including the gas
vessel f. In order to be able to place the swinging or weighing parts easily in
equilibrium, a removable plug i is fitted in the side of the case a for access to the
same. k is a nozzle filled with wadding for keeping back dust and serving for the
admission of fresh air into the air space e of the case a (Figs. 1, 2, 5, 6) or into
the air container e¹ (Figs. 4, 7).
If now gas of greater specific gravity than that of the air is caused to pass into
the gas vesself the weighing body d will be driven upwards and the pointer z moved
from the right to the left, which movement may be read direct from the scale m.
A contrary movement or stroke of the pointer takes place when lighter gases are
caused to pass through the gas vessel f.
Generally the gases to be weighed are drawn through the gas vesself by means
of an aspirator or suction appliance in the direction shewn by the arrows 1, 2. The
rarefication thereupon taking place extends through the orifice n also to the air
space e and e', and this whilst the balance is being used, causes the passage always
of some air through the nozzle k into the chamber or case a in the direction shewn
by arrow 3, the object being to again supply the case a with fresh air in case gas
should be diffused in the air space e, therefore the gases pass out of the vessel
(Figs. 1, 4, 5, 6, 7) in the direction shewn by arrow 2 together with some air mixed
therewith and which has entered in the direction of, arrow 5, but the outlet ³ is so
arranged on the vesself that the weighing body d is played upon only by the gas
to be weighed, unmixed with air. In the construction shewn in Figs. 1, 4, 5, 6, 7,
the orifice is always connected to the gas supply pipe.
In Fig. 1, the orifices 1 and r¹ are connected by a hose or tube t¹ and orifices 2
and by a hose or tube ť².

page_text: In the apparatus shewn in Fig. 2 the gas vessel is shut off from the air space e of
the casing a by a water or other liquid seal, this having for object to prevent any
diffusion between gas and air. In this case the gas vesself is provided with a pipe
surrounded by a vessel o in which latter is placed the liquid seal p into which dips
a bell shaped receiver 9 so as to completely shut off the gases to be weighed from
the air space e of the gas balance. The fluctuations of the weighing body d are
carried over to the beam 6 through the suspension frame u dipping into the liquid
seal.
In order that the weighing operation may not be affected by the varying
quantities of the liquid p displaced in the up and down movements of the suspension
frame u there may be arranged at the other side of the prism or knife edges of the
beam b, for example underneath the weighing body c, vessels o¹, o', supplied with
liquid of the same kind as that in the vessel o, said vessels being in communication
with one another and also in any suitable manuer, for example by a tube t', with the
vessel o, and from the weighing body care suspended the frames a so as to dip into
the liquid contained in the vessels o¹.
The aggregate cross sectional area of the dipping frames x is with a beam b
having arms of equal length, the same as that of the dipping frame u so that
the latter, in the oscillations of the beam b, displaces in the vessel o just so
much of the liquid p as the frames displace in the vessels o' or inversely the
level of the liquid in the several vessels always being the same. With the arms
of beam 6 of unequal length the aggregate cross sectional area of the dipping
frames differs from that of the frame u, and also the quantity of liquid
displaced, in proportion to the difference in the length of said arms.
Fig. 3 shews the application of only one dipping body a, dipping into one
vessel o'.
the
In order that the gases shall not remain stagnant in the pipe / and receiver
latter is provided with an orifice which, by a tube t communicates with an
orifice w in the side of the case a. This orifice w, as also the orifice in the gas
vesself is in connection either with the gas discharge pipe or with the gas supply
pipe, consequently in the construction of gas balance shewn in Fig. 2, the gas may
be caused to flow just as well through the gas vessel f, the pipe 1 and the receiver q
from below upwards in the direction shewn by arrows 1, 2, as in the reverse
direction from above downwards.
The air nozzle k is always in communication with the discharge pipe so that in
all parts of the gas balance there is an equal pressure and no fluctuations of
pressure to affect the weighing of the gases.
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:-
:-
1. A gas balance in which any suitably formed weighing bodies c, d, are
of
suspended from or attached to a balance b located in a closed case a any
suitable form, of which weighing bodies the one c located on one side of the
knife edges is suspended in air and the other d in the gas to be weighed, and
in which the body d is enclosed in a gas vessel ✓ located in or adjacent to the
case a through which vessel the gases to be weighed are conducted, and in which
also the body c may be enclosed in a special air chamber e, substantially as
described and shewn.
2. For the purpose, in the gas balance referred to in Claim 1, of preventing the
diffusion of the gases to be weighed into the air chamber e or inversely, the
arrangement of a liquid seal (Fig. 2) between the gas vessel f and the air space e
said arrangement being characterised by the provision in connection with the gas
vesself of an open pipe surrounded by a vessel o containing the liquid seal pin
which may move the U shaped frames u carrying the body d and in which dips the
bell shaped receiver g, the orifice v of which for preventing stagnation of the gases,
is in communication by the tube t, with the orifice w in the case a and through said

page_text: orifice w with the common gas supply or gas discharge pipe, substantially as
described and shewo.
3. In the liquid seal referred to in Claim 2, the arrangement of the bent U shaped
dipping frames u carrying the weighing body d and reaching on the one hand down
into the vessel o and on the other hand rising into the bell shaped receiver 9, as also
the arrangement of the dipping body or dipping bodies a suspended from the
balance on the opposite side of the knife edges and dipping into the vessel or
vessels o¹ communicating with the vessel o and containing the liquid p, the aggregate
cross sectional area of the body or bodies being so measured as to compensate for
any difference in the length of the arms of the beam b and for the variations in the
movement of the frames u due to the varying displacements of the liquid upon the
oscillations of the beam 6 (Figs. 2, 3), substantially as described and shewn.
Dated this 27th day of December 1895.
CAPITAINE & VON HERTLING,
89 Chancery Lane, London, W.C., Agents for the Applicant.