IMPROVEMENTS IN THERMOMETRIC APPARATUS
Year: 1857

page_text: LETTERS PATENT to William Henry Gauntlett, of Middlesbro'-on-Tees,
for the Invention of "IMPROVEMENTS IN THERMOMETRIC APPARATUS."
PROVISIONAL SPECIFICATION left by the said William Henry Gauntlett
at the Office of the Commissioners of Patents, with his Petition, on the
14th July 1857.
I, WILLIAM HENRY GAUNTLETT, of Middlesbro'-on-Tees, do hereby declare
the nature of the Invention for "IMPROVEMENTS IN THERMOMETRIC APPARATUS,"
to be as follows :-
This Invention has for its object improvements in thermometric apparatus.
For this purpose I employ a tube of zinc or other metal, in the interior of
which there is a rod of wood, porcelain, or other suitable material, which
expands but slightly or not at all with heat; one end of the rod is connected
to the tube, and to the other end of the rod is connected a lever or arm, which
is caused constantly to press or act against the end of the tube by means of
a spring, or the arm may be caused to move by means of toothed gearing.
To the end of the lever or arm is attached a pencil or marker, the point of
which is caused constantly to press against a strip of paper or other suitable
material carried by a roller or moving surface actuated by clockwork. By
this arrangement of apparatus when the tube of metal expands or contracts,
according to the variations of temperature, the lever or arm is caused to move,
and the pencil marks on the paper.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Henry Gauntlett in the Great Seal Patent Office on
the 14th January 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
ENRY GAUNTLETT, of Middlesbro'-on-Tees, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourteenth day of July, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twenty-first year of Her
reign, did, for Ilerself, Her heirs and successors, give and grant unto me,
the said William Henry Gauntlett, Her special licence that 1, the said William
Henry Gauntlett, my executors, administrators, and assigns, or such others
as I, the said William Henry Gauntlett, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN THERMOMETRIC APPARATUS," upon the condition
(amongst others) that I, the said William Henry Gauntlett, my executors or
administrators, by an instrument in writing under my, or their, or one of their
hands and seals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Henry Gauntlett, do hereby
declare the nature of the said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
This Invention has for its object improvements in thermometric apparatus.
For this purpose I employ a tube of zinc or other metal, in the interior of
which there is a rol of wood, porcelain, or other suitable material, which
expands but slighly or not at all with beat. One end of the rod is connected
to the tube, and to the other end of the rod is connected a lever or arm, which
is caused constantly to press or act against the end of the tube by means of a
spring, or the arm may be caused to move by means of tooth gearing. To
the end of the lever or arm is attached a pencil or marker, the point of which
is caused constantly to press against a strip of paper or other suitable
material carried by a roller or moving surface actuated by clockwork. By
this arrangement of apparatus when the tube of metal expands or contracts,

page_text: according to the variations or temperature, the lever or arm is caused to move,
and the pencil marks on the paper.
Having thus stated the nature of my said Invention, I will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a longitudinal section of the combined apparatus according
to my Invention, the section being taken on the line A, B, on the other
Figures of the Drawing; Figure 2 shows the thermometric apparatus, the
clock and front part being removed; and Figure 3 shows an elevation. C, C,
is a tube of zinc, which is the material preferred to be used, and it is desirable
to have it as long as conveniently inay be. One end of this tube is opened
and rendered flat and fixel to the projection D*, fixed at right angles on the
plate D, which is fixed to the case. The projecting plate D*, where it comes
in the notch or recess, is made with a knife edge E, and such knife edge and
the recess in which it nets may be of steel or other suitable hard material.
The other end of the tube C has a link or eye fixed to it when the apparatus is
to be suspended by the tube, as is.the case in respect to the instrument shown
in the Drawing; but when the case of the instrument or other end of the tube
is to be fixed, the outer end of the tube C will be free. I is a rod of wood,
preferring yellow pine for this purpose, though other material may be used in
place thereof. The outer end of the rod I is fixed to the outer end of the tube
C, as is shewn; the other end of the rod has fixed to it hooked formed ends,
having a knife edge K resting within the recess or notch in the lever F, and
such knife edge and recess are made of steel or other suitable hard material.
L is a spring constantly acting to draw one end of the lever F towards it. To
the lever F is fixed an arm G by the screws H, II. This arm carries a
marker at its other end, and the arm G is made with a tendency to bear or
spring towards the surface of the barrel or cylinder O, on the surface of which
the paper or suitable material to be marked is applied. M is the clockwork
movement to measure time, and the same may be arranged in any suitable
manner for going the length of time desired. The clockwork or mechanical
movement gives motion to the screw shaft or spindle N, which gives motion to
the cylinder or barrel O, so as to cause such cylinder or barrel to rotate in
any desired time.
I would remark that I make no claim to the arrangement of clock-
work shewn, and the same may be varied; nor do I claim the con-
struction of thermometric apparatus wherein two substances which vary in
the extent of the'r expansion; and although I prefer the arrangement of

page_text: thermometric apparatus shown and described, such arrangement may be varied
without departing from my Invention. What I claim is the combining
thermometric apparatus such as herein described, with clockwork suitable for
obtaining motion between the marker and the paper or surface on which the
marker acts.
In witness whercof, I, the said William Henry Gauntlett, have hereunto
set my hand and seal, this Thirteenth day of January, in the year
of our Lord One thousand eight hundred and fifty-eight.
Witness,
S. CARPMAEL.
WILLIAM HY GAUNTLETT. (L.S.)