Year: 1896

page_text: Date of Application, 14th Oct., 1896
TJ
14th
1007
Secantad 11th Jon 1000
I, ERNEST BÖHM, of 5, Boxworth Grove, Richmond Road, Barnsbury, in the
County of Middlesex, Chemical and Experimental Glass Blower, do hereby declare
the nature of this invention to be as follows:-
The object of this invention is to provide X-ray tubes with means for abstracting
therefrom the luminous lights which interfere with the rays known as the X-rays
rendering the tube more effective for its purpose; and also with means for increasing
the luminosity of the pure X-rays in the tube.
To carry out my invention I provide the tube with an internal hollow glass vessel
in any suitable shape or form which communicates with an open neck or shoulder
projecting through one side of the tube. This vessel is situated in rear of the
cathode and in such a position relatively thereto as to act as a focussing reflector
collecting and directing all the luminous rays through the opposite side of the tube.
This reflector is coated on its inside with silver nitrate or other reflecting medium.
When coated with silver nitrate the latter will attract and remove all the useless or
luminous electric waves or rays which interfere with or are injurious to the rays
known as the X-rays; but when coated or filled with other reflecting medium, or
with silver nitrate reflectors if so desired, I fill into the open neck or shoulder which
communicates with the rear of the reflector or vessel a substance or material such
as a solution of silver nitrate, fluorescene, uranium, or quinine, or a steel magnet or
magnetized steel filings or any other substance or material which will exercise an
attractive force and will abstract the aforementioned interfering waves or rays from
the X-rays thereby giving more power and clearness to the so called X-rays.
ALL Jay of Oatahan 1906
F. W. GOLBY,
36, Chancery Lane, London, W.C., Patent Agent for the Applicant.
I, ERNEST BÖHM, of 5, Boxworth Grove, Richmond Road, Barnsbury, in the County
of Middlesex, Chemical and Experimental Glass-Blower, 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:-
The object of this invention is to provide X-ray tubes with means for increasing the
luminosity of the pure X-rays produced and reflecting the same; and also means for
abstracting luminous lights which interfere with or obstruct the X-rays.

page_text: In carrying out the invention the tube is to be provided with an internal hollow
glass vessel, of suitable shape or form which communicates with an open neck or
shoulder on the rearward side of the tube and in such position relatively to the field
of the rays given off between the anode and cathode terminals as to act as a focusing
reflector, for collecting and directing the rays forward from the bulb of tube.
The aforesaid internal hollow glass vessel is hermetically closed to the internal
vacuum of the tube by being blown into and of a piece with the glass of the bulb or
the neck or shoulder thereof as aforesaid.
In this way the hollow glass vessel will be open to the external air whilst it is
closed to the interior of the X-ray tube, and said vessel may be coated with nitrate of
silver or other reflecting medium, which will serve as a coating to the disc of the re-
flector vessel and serve to attract and remove useless interruptive or luminous electric
waves of light or rays which are injurious to or interfere with the rays known as the
X-rays.
Said reflector vessel may be employed as a container for reception of and holding a
substance or material such as a solution of silver nitrate, fluroscene uranium or
quinine, or a steel magnet or magnetised steel filings, powdered salts or metallic sub-
stances, or any other substance or material, which will exercise an attractive action
and serve to take up or abstract interfering waves of light or rays, which may be pre-
sent, from the X-rays and thereby afford more power, better quality or greater clear-
ness to the so-called X-rays. The said container vessel may be plugged or stoppered
with cork or other stopper for enclosing and retaining the material employed whether
same be in form of powder or solution or to serve to exclude accession of air to the
interior of said vessel.
In the drawings annexed hereto there is represented X-ray tubes constructed ac-
cording to this invention and the same will be referred to by figures and letters in
the following description.
Fig. 1, is a side view of such a tube.
Fig. 14, is a sectional view, broken away, of the reflector container vessel as applied
to the bulb of the X-ray tube.
Fig. 2, is a front view of such tube.
Fig. 3, represents in front view an X-ray tube, wherein a strong current can be
employed, and arranged with three cathode poles.
Fig. 4, is a side view of the tube shown in Fig. 3.
a, is the main bulb of the X-ray tube, a¹ the lower extension and a² the upper
extension thereof. b is the stem for holding or supporting the tube. The electrode
poles of the electric circuit are shown at c, d and are carried into the interior of the
vacuum tube, a, a² a, or b, through glass stems, blown into and rendered of a piece,
with the main tube.
The stem e is of glass supporting the platinum plate reflector el below the "field"
of the rays.
Rearward of the X-ray tube and of the "field" there is applied the neck piece f
and to this neck or projection of the bulb a, there is "blown-in" so as to be of a piece
therewith the glass receptacle or container vessel g.
This vessel g, is closed to the interior of the X-ray tube and is open exteriorly to
receive any coating or silvering that may be required, or any matter of contents,
fluid, or solid as may be found desirable or expedient and as before indicated.
In addition to other points of advantage attained by this form of reflector vessel g,
there is secured a greater degree of opacity suppressive of the diffusion of the X-rays
evolved.
The modification of construction illustrated, in Figs. 3, and 4, shows an application
of the electrodes in combination with the vessel and reflector for employment of
stronger currents.
There are three extensions a² of the X-ray tube, and three terminals for the
electric current, leading into said extensions and terminating, as is usually provided,
with a disc.

page_text: The axial lines of these terminals converge upon the reflector e¹, e², which is made
with three planes of reflection as shown and supported by the glass stem e.
In this case the wire d (enclosed in a glass stem) constituting one pole of the
electric circuit, is carried around, so as not to obstruct the field of reflection or
operation of the reflector, or container vessel g.
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 :-
Firstly. The improved X-ray tubes constructed, combined, and operating as and
for the purpose herein set forth and described in reference to and shown by the
drawings.
Secondly. In X-ray tubes substantially as herein set forth the vessel g, as and for
the purpose herein set forth.
WALTER A. BARLOW,
306, High Holborn, Agent for E. Böhm.