IMPROVEMENTS IN AIR PUMPS
Year: 1883

page_text: LETTERS PATENT to Frank Wirth of the firm of Wirth and Company, Patent
Solicitors, at Frankfort on the Main, in the Empire of Germany for an
Invention of "IMPROVEMENTS IN AIR PUMPS" a communication from Hendrik
Beins, Doctor of Medicine and Jan Frederik Beins, both persons resident at
Groningen in the kingdom of Netherlands
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 13th March 1883.
FRANK WIRTH of the firm of Wirth and Company, Patent Solicitors, at
Frankfort on the Main, in the Empire of Germany "IMPROVEMENTS IN AIR
PUMPS [A communication from Hendrik Beins, Doctor of Medicine and Jan
Frederik Beins, both persons resident at Groningen in the kingdom of Netherlands]
"
This invention relates to improvements in air pumps and is illustrated in the
accompanying drawing.
The cylinder of the pump B is plunged into water or any other liquid or its
construction is such that the liquid remains in C. To allow the piston A, to be
moved the pump rod passes through the liquid and out at the opening C¹. At the
other end the cylinder B, is in communication with a vessel E, closed at the top;
the vessel E, contains liquid.
In the vessel E, is placed the vessel F, containing mercury. The tubes G, and I,
open into the cover of the vessel E., the tube G, plunging into the receiver F. con-
taining mercury, the other tube I, allows free passage of the air in E,. The other
end of the tube G, terminates in the receiver H, and the tube I, plunges into the
mercury in the vessel K. By operating the rod which passes through the side of
the vessel E, the vessel F, will be caused to ascend or descend at will.
To operate the pump the piston A, is moved and the liquid in the vessel E, will
fall by its own gravity and so form a vacuum in E. The air contained in the
receiver H, will pass through the mercury in F, and occupy the place of the water
Price Gd1

page_text: just withdrawn in E. The piston being now moved back to its former place
shewn in the drawing the water will be driven back into E.
The air which has been driven from H, not being able to return as the tube G,
is now closed by the mercury in F, it is forced through the tube I, into the
receiver K, and will escape into the atmosphere through the mercury therein.
It will be evident that the tubes G, and I, should have a length at least equal to
that of a barometer tube.
By repeating the hereinbefore described operations a vacuum will be produced
in the receiver H, this vacuum will however be limited by the depth to which the
tube G, is plunged into the mercury of the vessel F. The rod L, allows the vessel F,
to be lowered when the piston is operated

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 12th September
1883.
FRANK WIRTH of the firm of Wirth and Company, Patent Solicitors at Frankfort-
on-the-Main, in the empire of Germany "IMPROVEMENTS IN AIR-PUMPS"
A com-
munication from Hendrick Beins, Doctor of Medicine, and Jan Frederik Beins, both
persons resident at Groningen, in the Kingdom of Netherlands
This invention relates to improvements in air pumps and in order to enable tho
invention to be fully understood I will describe the same by reference to the
accompanying drawing which represents an elevation partly in section of an air
pump constructed according to this invention,
The cylinder B, of the pump is plunged into water or other suitable liquid or is
connected with a receiver (such as that shewn in dotted lines at C) containing the
liquid.
To allow the piston A, to be moved, the piston rod D, passes through the liquid
and out at the opening C. At the other end the cylinder B is in communication
with a vessel E closed at the top, the vessel E, containing liquid.
In the vessel E, is placed the vessel F, containing mercury. The tubes G and I
open into the cover of the vessel E, the tube G, plunging into the receiver F, con-
taining mercury; the other tube I allows free passage of the air from the vessel E.
The other end of the tube G, terminates in the receiver H, and the tube I plunges
into the mercury in the vessel K. By operating the rod L which passes through
the side of the vessel E, the vessel F, will be caused to ascend or descend at will.
To operate the pump, the piston A, is moved from the positions shewn in the
drawing and the liquid in the vessel E, will fall by its own gravity and so form a
vacuum in E. The air contained in the receiver H, will pass through the mercury
in F, and occupy the place of the water just withdrawn from E. The piston being
now moved back to its former place shewn in the drawing the water will be driven
back into E.
The air which has been drawn from H, not being able to return at the tube G is
now closed by the mercury in F, it is forced through the tube I, into the receiver K,
and will escape into the atmosphere through the mercury therein.
It will be evident that the tubes G, and I, should have a length at least equal to
that of a barometer tube.
By repeating the hereinbefore described operations the vacuum will be increased
in the receiver H; this vacuum will however be limited by the depth to which the
tube G, is plunged into the mercury of the vessel F. The rod L, allows the vessel F,
to be lowered when the piston is operated.
Having thus described the invention communicated to me, I would have it
understood that what is claimed and intended to be protected by the herein in
part recited Letters Patent is :-
Firstly. In an air pump the arrangement and employment of the vessels F
and K, containing mercury the said vessels serving as valves by allowing the
passage of air in one direction but preventing the return of the air as and for the
purposes hereinbefore described and represented in the accompanying drawing.
Secondly. In an air pump the piston A, in combination with the cylinder B,
vessel E, mercury vessels F and K, and tubes G and I arranged and operating as
and for the purposes hereinbefore described and represented in the accompanying
drawing

page_text: Thirdly. The general arrangement and construction of the improved air pump
operating substantially as and for the purposes hereinbefore described and
represented in the accompanying drawing
In Witness whereof I the said Frank Wirth have hereto set my hand and seal
this tenth day of September in the year of our Lord one thousand eight hundred
and eighty three