Improved Apparatus for Ascertaining or Comparing the Specific: Gravity of Gases and Gaseous Mixtures.
Year: 1895

page_text: Date of Application, 18th Apr., 1895-Accepted, 18th Apr., 1896
COMPLETE SPECIFICATION.
Improved Apparatus for Ascertaining or Comparing the Specific:
Gravity of Gases and Gaseous Mixtures.
I, ALPHONS CUSTODIS, Engineer, of Rubenstrasse, 23, Düsseldorf, in the
German Empire, 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 relates to gas scales or instruments for the accurate determination
of the weight of gaseous matter, and will be described by the aid of the annexed
drawing, which is a vertical section of a gas-balance embodying my invention.
The apparatus chiefly comprises a casing containing two compartments k, k¹, in
which are suspended two light bodies b, b', of equal weight and volume, and which
have on one side or at the top openings o communicating with an outlet canal a,
while each of the said chambers has an independent inlet s or 8¹ situated at the
bottom of the same.
The said bodies b b¹ are suspended from opposite ends of a scale beam w, placed.
in a separate compartment and provided with an index finger z adapted to indicate
on a graduated scale the position of the scale beam, which depends on the difference
between the specific gravities of the gases contained in the compartments k and k¹..
The gradations on the scale may indicate the difference between the specific
gravities of the two gases, or the specific gravity of one of them, or any other
numerical value capable of being determined from the motion of the scale.
beam.
One of the gases or gas mixtures is admitted to one compartment through the
inlets and the other to the other compartment through the inlet s'. The same
instrument may be conveniently used for ascertaining the loss or increase of weight.
produced on a gas or gas mixture by mechanical or chemical treatment, in which
case one of the compartments is supplied with gas as it is before treatment, and at
the same time the other compartment is supplied with gas as it is after treatment..
The flow of gases into the compartments is preferably produced by suction.
Such an instrument may be used also a coal-mines for indicating changes in the
composition of the atmosphere, and may be combined with means for electrically
indicating the position of the instrument at a distant station.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. Apparatus for ascertaining or comparing the specific gravity of gases and
gaseous mixtures, comprising in its construction a casing provided with two com-
partments having independent inlets, and outlets communicating with each other,
a pair of light bodies of equal weight and volume, each of which is freely
suspended in one of the said compartments and adapted to rise and fall therein,.
a scale beam from which the said light bodies are suspended at opposite ends, and
a graduated scale adapted to indicate the difference between the gas densities.
corresponding to various positions of the scale beam, or other numerical values.
depending on said difference, substantially as described.

page_text: 2. An instrument for indicating the specific gravity of gases or gas mixtures,.
constructed and adapted to operate substantially as described and illustrated.
Dated this 18th day of April 1895.
FAIRFAX & WETTER,
433, Strand, London, Agents.