Year: 1886

page_text: Date of Application, 24th Nov., 1886.
Complete Left, 13th May, 1887.
Complete Accepted, 15th July, 1887.
We GEORGE GRAHAM FORSTER Licentiate in Dental Surgery of 24 Compton
Terrace Islington and WILLIAM BARRY Sanitary Engineer of 24 Compton Terrace
Islington in the County of Middlesex do hereby declare the nature of this invention
to be as follows:-
Two Hollow balls preferably made of India Rubber or other elastic material
connected by a Hollow pipe or tube and each having a similar pipe or tube inserted
at the opposite extremity and each Ball contains a valve so constructed as to prevent
the saliva passing into the Ball from returning the same way. This apparatus is
applied to any small pipe of Glass metal or other material placed in the mouth and
when the upper Ball is compressed & then allowed to expand the saliva is drawn down
from the mouth into it, when again compressed the saliva in it passes into the lower
Ball and from thence into any receptacle placed to receive it and by repeating this
action the mouth is kept perfectly dry where required.

page_text: WO GEORGE GRAHAM FORSTER of 24 Compton Terrace Islington in the County of
Middlesex Dental Surgeon and WILLIAM BARRY of 55 Chancery Lane in the County
of Middlesex Contractor 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:—
Our invention consists of two hollow balls or spheres preferably of india rubber or
other material joined by a hollow pipe or tube issuing from the opposite extremity of
each ball or sphere. Inside each ball or sphere is inserted a valve of peculiar con-
struction and the whole is attached at one end of the tube to another tubo of glass,
metal, or other material to be to be placed in the mouth during dental operations.
That our invention may be easily understood we append a drawing shewing in Fig. 1
an elevation and Fig. 2 a section of the Saliva Pump.
A, is the glass tube.
B, the upper ball or sphere.
C'the lower ball or sphere.
Da glass tube connecting the bottom tube of the saliva pump to another tube for
the purpose of discharging the saliva into any suitable receptacle E.
Fig. 2 shews the pump in section the same letters denoting similar parts. F and G
are the upper and lower valves.
The action of the pump is as follows. The glass tube A being placed in the mouth
and the upper ball or sphere being compressed by the hand the air contained in it is
exhausted and the saliva passes freely in thro' the non return valve F, which opens
downwards, when the ball B is charged or full of saliva, it is again compressed the
liquid forced thro' the lower non return valve G into the lower ball or sphere C, and
is discharged thro' the tube D, into any receptacle for the purpose, and by a repitition
of the action described the mouth is dept dry where required.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is,
1st. A Dentists saliva pump constructed by means of two or more downward action
non-return valves, elastic tubes and elastic balls or spheres as abovo described.
2nd. The combination of the glass tube for the mouth and the dentists saliva pump
as above described.
Dated this 13th day of May 1887.