Improvements in and connected with the Stoppers or Caps of Bottles containing Medicinal or other Liquids.
Year: 1892

page_text: Date of Application, 19th July, 1892
Complete Specification Left, 14th Apr., 1893-Accepted, 2nd June, 1893
IONAL MOTIVATION.
Improvements in and connected with the Stoppers or Caps of
Bottles containing Medicinal or other Liquids.
FREDERICK WILLIAM FLETCHER Beauchamp Lodge Enfield Middlesex
Manufacturing Chemist do hereby declare the nature of this invention to be as
follows:-
In the Specification of previous Letters Patent granted to me dated the
4th June 1891, and numbered 9486 I have described a stopper or cap for bottles
containing medicinal and other liquids having a contrivance attached by means of
which said liquids may be withdrawn and measured without the aid of any other
instrument or vessel, said invention being called an autometric stopper or autometron.
My present invention relates to an improvement in the formation of said auto-
metric stopper or autometron and its object is to enable liquids to be measured
more conveniently accurately and expeditiously.
In Specification of aforesaid Letters Patent I direct the pressure on the air
chamber to be gradually released until the liquid to be measured has risen to the
desired point in the graduated tube, whereupon by removing the arrangement, and
once more compressing the air chamber, the liquid can be transferred to another
vessel. Experience shows that there are certain objections to this method. If,
for instance, it is desired to measure a volume of liquid which will occupy only a
portion of the tube it is difficult to maintain a perfectly steady pressure on the
partly expanded air chamber, the result being, that if the pressure is increased
a portion of liquid is expelled from the tube, and if the pressure is relaxed air is
sucked up through the liquid, thus interfering with correct measurement.
the same objection applies if the tube is first filled with liquid by allowing the
air chamber to fully expand, and then forcing out the required volume by further
pressure.
Much
In my improved autometric stopper the air chamber is provided with a self
closing aperture or valve, by means of which air can be admitted at will into the
graduated tube, and the necessary volume of contained liquid thereby displaced.
Dated this 19th day of July 1892.
FRED. W. FLETCHER.
COMPLETE SPECIFICATION.
Improvements in and connected with the Stoppers or Caps of
Bottles containing Medicinal or other Liquids.
I, FREDERICK WILLIAM FLETCHER of Beauchamp Lodge, Enfield, Middlesex,
Manufacturing Chemist, 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 :-
In the Specification of previous Letters Patent granted to mne dated the
4th June 1891 and numbered 9486 I have described a stopper or cap for bottles
containing medicinal and other liquids having a contrivance attached by means of
which said liquids may be withdrawn and measured without the aid of any other
instrument or vessel, said invention being called an autometric stopper or auto-
metron. My present invention relates to an improvement in the formation of said
autometric stopper or autometron and its object is to enable liquids to be measured
more conveniently, accurately and expeditiously.
In Specification of aforesaid Letters Patent I direct the pressure on the air
Price 8d.I

page_text: chamber to be gradually released until the liquid to be measured has risen to the
desired point in the graduated tube, whereupon, by removing the arrangement and
once more compressing the air chamber the liquid can be transferred to another
vessel. Experience shows that there are certain objections to this method. If,
for instance, it is desired to measure a volume of liquid which will occupy only a
portion of the tube, it is difficult to maintain a perfectly steady pressure on the
partly expanded air chamber, the result being that if the pressure is increased a
portion of the liquid is expelled from the tube, and if the pressure is relaxed air
is sucked up through the liquid thus interfering with correct measurement. Much
the same objection applies if the tube is first filled with liquid by allowing the air
chamber to fully expand and then forcing out the required volume by further
pressure. In my improved autometric stopper the air chamber is provided with
a self closing aperture or valve by means of which air can be admitted at will
into the graduated tube and the necessary volume of contained liquid thereby
displaced.
The accompanying drawing represents a vertical section of my improved stopper.
A is the perforated stopper carrying the suction tube B. C is the elastic air
chamber. Opening out of this is a second and smaller chamber D which is provided
at any convenient point with a self closing aperture or valve. In the drawing this
is shown at E.
The action of the arrangement is at follows.
The suction tube 13 is dipped into the liquid and the elastic air chamber C com-
pressed by the fingers. On relaxing the pressure the liquid will rise in the tube
and there remain until it is desired to discharge the whole or any portion of it.
To do this it is simply necessary to lightly compress the small air chamber D.
This causes the self closing aperture or valve E to open and air being thus
admitted the column of liquid in the tube B falls until the pressure is relaxed.
I find by experience that the simplest and most effectual form of air inlet to
the small chamber D is a small transverse slit at the top. Owing to the elasticity
of the india rubber or other similar material of which the air chamber is formed
such an aperture closes itself automatically and will only open when pressed.
I do not of course limit myself to this character of opening if it is found more
convenient to employ any other form of aperture.
Neither do I restrict myself to placing the aperture or valve at the top of the
chamber D as shown. The same result may, under certain circumstances be
obtained by placing the said aperture or valve in the side or other portion of the
wall of the said chamber.
In place of the stopper A a cap to fit over the neck of the bottle may be
substituted if desired.
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 improved stopper or cap for bottles containing liquids having a contrivance
attached by means of which the said liquids may be withdrawn and measured
without the aid of any other instrument or vessel substantially in the manner
herein described and as illustrated by the accompanying drawing.
Dated this 14th day of April 1893.
FRED. W. FLETCHER.