Improvements in Clinical Thermometers.
Year: 1894

page_text: Date of Application, 13th July, 1894
Complete Specification Left, 5th Apr., 1895-Accepted, 11th May, 1895
PROVISIONAL'SPECIFICATION.
Improvements in Clinical Thermometers.
I, LUIGI PERONI of 45 Hatton Garden in the County of London, Glass Blower,
do hereby declare the nature of this invention to be as follows:-
The invention relates to that class of clinical thermometer having an external
tube which covers and protects the scale, figures and markings from injury, and
consists of a thermometer having an indestructible index with an outer protecting
tube.
In constructing my improved clinical thermometer I proceed somewhat as follows:
I take a length of cane glass having a lens or other front, and I seal by, fusion, one
end and blow a chamber therein, I then draw out the end containing, said chamber
somewhat long and thin and seal the other end of the tube.with, wax.
The tube thus sealed at both ends is then melted at a certain distance from the
small drawn out end, and drawn out somewhat..smaller-in diameter for a certain
length and a chamber, to be used in forming the indestructible index, is blown, at
the upper part of such reduced portion.
A length of thin glass tube to form a protecting tube is then melted at one end
and drawn out into a long thin. splint, the inner tube, is then, placed within. the
protecting tube with its small drawn out end. within the upper part of the, splint of
the protecting tube, and these two latter parts are then fused. together, and the
mercury bulb is blown from the splint of outer tube. The top end of inner tube is
now. opened out the air contained therein is driven out and the tube is completely
filled with mercury. The range of scale is now.tried, after which the outer tube is
cut about a quarter of an inch below the chamber to be used in forming the
indestructible index and its upper loose part is taken off the inner tube. The top
end of the inner tube is melted and drawn out into a splint and a small chamber is
at the same time blown in such top end. The inner tube is now warmed so. as to
throw part of the mercury from the bulb into the top chamber after which the part
of the inner tube containing the chamber to be used in forming the indestructible
index is melted and contracted to form the said index.
The length of the inner tube is now adjusted and sealed by the blow pipe and the
surplus metal cut off after which a piece of plain glass, is fused.on. to it.
The inner tube is now pointed and divided and otherwise marked after which.the
loose part of the outer tube is placed over the inner tube and joined by fusion to the
fixed part thereof and to the solid glass at the top end of the inner tube the reduced
part of the inner tube, enabling the two parts of the outer tube to be fused together
without unduly heating the said inner tube.
Dated July 13th 1894.

page_text: improvements in Clinical Thermometers.
I, LUIGI PERONI, of 45 Hatton Garden, in the County of London, 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 invention relates to that class of clinical thermometer having an external
tube which covers and protects the scale, figures and markings from injury.
Heretofore such external protecting tube has not been applied to clinical
thermometers provided with-an-indestructible index, the method of manufacture
hitherto adopted being inapplicable to such class of clinical thermometer.
I have however devised means whereby I can apply an outer protecting tube to
a clinical thermometer having an indestructible index, and my invention consists of
such a thermometer with its divided or scaled tube hermetically enclosed within an
outer protecting glass tube.
I will describe, by the aid of the accompanying drawings, the method I adopt in
carrying my invention into effect.
In constructing my improved clinical thermometer I proceed as follows:-
I take a length a of cane glass such as is ordinarily employed for thermometer
tubes and having a lens or other front, and I seal one end a¹ by fusion and blow a
chamber 6 therein as represented at Fig. 1. I then melt and draw out the end a¹
containing said chamber b somewhat long and thin. I then allow the tube to cool
so as to fill it with air, after which I seal the other end a² of the tube with wax as
represented at Fig. 2. The tube thus sealed at both ends is then melted at a certain
distance from the small drawn out end a' and drawn out at a somewhat smaller in
diameter for a certain length as shown at Fig. 3, and a chamber c to be used in
forming the indestructible index is blown at the upper part of such reduced portion a³
as represented at Fig. 4 by applying a narrow flame around such part to melt the
glass, when the internal air will expand and form such chamber c. A length of
thin glass tube d to form a protecting tube is then melted at one end and drawn out
into a long thin splint d' as represented at Fig. 5. The tube a, in the form shown
at Fig. 4, except that the splint is cut off at the line X-X thereby opening up the
bore, is then placed within the projecting tube d with its small drawn out end
within the upper part of the splint d' thereof, and these two latter parts are then
fused together and the mercury bulb e is blown from the splint d'. The top end a³
of the tube a is now opened out or unsealed, the air contained in such tube is driven
out and the tube a is completely filled with mercury. The range of scale is now
tried in the usual manner, after which the outer tube d is cut about a quarter of an
inch below the chamber c aud its upper loose part is taken off the inner tube a,
leaving the connected parts as represented at Fig. 6. The top end of the tube a is
now melted and drawn out into a splint and a small chamber fis at the same time
blown in such top end as represented at Fig. 7 by melting such top end and warming
the tube a so as to throw part of the mercury from the bulb e into the top end and
so form the chamber f; the tube is now allowed to cool, thereby leaving it in a
state of vacuum, after which the part of the tube a containing the chamber c to be
used in forming the indestructible index is melted and contracted to form the said
index. The length of the inner tube a is now adjusted in the usual manner and it
is sealed at the top end a' below the chamber by the blow pipe and the surplus
metal cut off, after which a piece g of plain glass is fused on to it as represented at
Fig. 8. The tube a is now pointed and divided and otherwise marked, after which
the loose part of the outer tube d is placed over the inner tube a and joined by
fusion to the fixed part thereof and to the solid glass 9 at the top end of the inner
tube a, the reduced part a³ of the tube a enabling the two parts of the outer tube d

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invention and in what manner the same is to be performed, I declare that what I
claim is :-
CLAIMS.
1. The combination with a clinical thermometer having an indestructible index,
of an outer protecting tube, substantially as herein shown and described.
2. The application to a clinical thermometer having an indestructible index, of an
outer protecting tube hermetically enclosing the divisions and reading and applied
thereto in manner, substantially as herein shown and described.
3. The improved clinical thermometer herein shown and described.
CLAIMS.
1. The combination with a clinical thermometer having an indestructible index,
of an outer protecting tube, substantially as herein shown and described.
2. The application to a clinical thermometer having an indestructible index, of an
outer protecting tube hermetically enclosing the divisions and reading and applied
thereto in manner, substantially as herein shown and described.
3. The improved clinical thermometer herein shown and described.
ԱՄԵՆԵԱ Ն iu Ա
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.