An Improved Fluid Meter.
Year: 1898

page_text: COMPLEIN DIMULTICATION.
An Improved Fluid Meter.
I, MARIUS OTTO, of 18, Avenue de Neuilly, Neuilly-sur-Seine, in the Republic
of France, Doctor of Science, do hereby declare the nature of tuis 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 relates to an apparatus serving for measuring the discharge or
feed of liquids or gases circulating in conduits of a given section, and for simul-
taneously registering the volume discharged per unit of time; the pressure and
the temperature.
The apparatus is especially applicable for exactly measuring large gaseous
discharges, such as it would be impossible to measure by means of ordinary gas
meters.
The principle, on which this improved counting and registering apparatus is
based, is as follows: If in a pipe of a given sections a fluid circulates at a medium
speed, the products will represent the volume of fluid which flows or passes
per unit of time. In the case of liquids it is practically useless to make corrections
with regard to pressure and temperature but the same does not apply in the case
of gaseous bodies.
The improved apparatus is illustrated in the accompanying drawing in which:
Figure 1 is a section of the same, and
Figure 2 is a detail view.
My apparatus is composed (see Figure 1) of a cylinder C of a given sections,
perpendicularly to the plane in which a wheel R is adapted to move which is
provided with small fans or vanes which give the medium speed of translation
of the fluid.
Where it is required to measure gaseous bodies (the accompanying drawing
showing an air meter) a Bourdon" pressure gauge M and a bi-metallic thermo-
meter Tare provided in the interior of the cylinder C.
The cylinder carries at its upper part an indicator I and a registering cylinder E
moved by clock work, and upon said cylinder two styles m and t for red and blue
ink, trace respectively the indications of the pressure gauge and those of the
thermometer.
The indicator is actuated by the endless screw V₁ which gears with the
wheel D¹. The shaft which supports the latter, drives, in its turn, a train of
wheels D2 D3, D4 D5-by the intermediary of an endless screw V³. These wheels,
the shafts of which are provided with indicating hands, adapted to move opposite
graduated circles, are provided with such a number of teeth that a hand placed to
the left of another hand, executes one revolution, while the other performs, ten.
For the purpose of graduating the apparatus the number of revolutions executed
per second by the wheel R by means of a current of a known rate of speed is
determined, and the number of teeth of the wheel D₁ and the pitch of the endless
screw V¹, are so proportioned as to enable the product 1, s at the temperature of
zero and at the pressure of 760 millimetres of mercury to be directly read from
the dial I.

page_text: The volume is registered per unit of time by the aid of a style V which the
hundreds wheel 14 applies at each revolution against the registering cylinders E
by the aid of a finger f.
Instead of having a registering cylinder, provided with a triplex graduation
such as indicated in Figure 1, I may employ a cylinder provided with three
superposed graduations, which admits of a far more convenient reading as shown
in Figure 2.
Between two points indicating the time which elapses during the passage of
say 100 cubic metres of air, I can see directly what has been the pressure and
the temperature.
In case where my metres are utilized for measuring liquids the transmission
mechanism must be carefully protected.
The latter may, however, be modified in any suitable manner, whether liquids or
gases are to be measured, namely according to requirements and circumstances.
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:
An apparatus for enabling the measurement of gases, of registering the dis-
charge or feed per unit of time, also the pressure and the temperature; the
characteristic feature being a fan-wheel R moving in a cylinder C of a uniform
and given section and driving the indicating apparatus.
Dated this 13th day of August 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.