IMPROVEMENTS IN REGISTERING THERMOMETERS OR THERMOGRAPHS
Year: 1885

page_text: I, WILLIAM MÜLLER, of 15, Abchurch Lane, in the city of London, Manu-
facturers' Agent do hereby declare the nature of said invention for IMPROVEMENTS
IN REGISTERING THERMOMETERS OR THERMOGRAPHS, a communication to me from
abroad by Carl Derckmann, attorney-at-law, of Dortmund in the German Empire,
to be as follows:-
This invention relates to apparatus for continuously and automatically recording
the successive temperatures of a given body or room during a certain time in a
similar manner, as steam pressures are recorded by steam engine indicators.
For this purpose I cause the expansion or contraction of a suitable body,
produced by change of temperature, to act upon a pen or pencil, placed in contact
with a travelling sheet of paper or other suitable material in such a manner that
the said pen or pencil is moved to and fro across the line of motion of the said
sheet, in proportion to the expansion and contraction of the said rod.
In further describing the invention reference will be made to the accompanying
drawing, of which Fig. 1, is a side elevation, Fig. 2 a side elevation with partial
section, Fig. 3 a partial end-elevation and Fig. 4 a plan of a thermograph suitable
for measuring the temperature of malt-drying rooms, while the remaining figures
represent details.
A metallic rod n, preferably of copper, is fixed at one end in the drying room
and projects with the opposite end into a box which contains the principal parts
of the thermograph. This rod n is in contact with one side p' of an angular
plate p suspended at one end m from a vertically adjustable slide and hinged at
the other end o to the short arm of a two-armed lever h. This lever has a slot h¹
and turns on a fulcrum s¹ secured to a stand 2, while the long arm of the lever
carries a pencil 9 held in contact with a drum d adapted to receive a continuous
rotary motion by means of a clock work e.
i is a regulating screw for the slide guided in a bracket fixed to the wall of
the casing; f is a lever pivoted to a fixed stand and holding the upper journal of
the drum d; d is the bottom plate of the drum mounted on the main axle of the
clock work. On the drum d is mounted a sheet of paper divided into sections by
a series of horizontal lines and a series of parallel upright curves.
.

page_text: If the rod n expands by beat, the hinge o of the plate p will be raised and the
pencil glowered as indicated in dotted lines by Fig. 2. Consequently the pencil g
will describe on the revolving drum d a diagram, the horizontal lines of which
denote the time, while the upright lines denote the corresponding temperature.
An electric alarm apparatus may be combined with the thermograph, so as to
ring a bell when the temperature of the drying room reaches a given limit.
This alarm apparatus may comprise a graduated arc S hinged at v to a bracket t
secured to the bottom of the casing by means of a screw u said arc carrying a
movable block adapted to come in contact with the lever h when the latter reaches
a certain hight, and thereby closing the circuit.of an electric bell.
x and y are conducting wires forming part of this circuit.
In the modification represented by Figs. 5. 6. and 7 the axis of the drum d is
horizontal and the pencil g held by an upright lever b, controlled by the extremity
of the rod n guided between rollers.
In Figs. 8. and 9. the marking sheet is not mounted on the circumference but on
the face of the drum d, and divided into concentric circles. The pencil is held by a
rod suspended from a lever h, which is connected with the rod n by a lever b
and link c. The latter is made of two parts connected by a coupling h¹, which
serves to vary the length of the link.
In Figs. 10. and 11. the rod n acts on a piston enclosed in the cylinder e¹
containing a fluid, which serves to displace a smaller piston or weight in a tube d¹.
This weight is suspended from a string e¹ passing over a pulley ƒ³ and connected
on the other side with a rod m¹ which carries the pencil.
In Fig. 12 the copper rod G is made hollow and supported near the free end by
a roller H. It abuts against a set screw f passing through the short arm of a
lever B suspended by means of a binge-joint from a rod rendered vertically
adjustable by a screw and nut D.
The long arm of the lever B. is connected with the short arm of the pencil
'carrier A by a flexible strap b, for which purpose the contiguous arms of the
levers A and B are enlarged and curved concentrically to the pivots of the
respective levers.

page_text: Improvements in Registering Thermometers or Thermographs.
'
I, WILLIAM MÜLLER, of 15 Abchurch Lane, in the City of London, Manu-
facturers Agent, do hereby declare the nature of this invention, a communication
to me from abroad by Carl Derckmann, attorney-at-law, of Dortmund, in the
German Empire, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to apparatus for automatically recording the variations of
temperature which take place in malt drying rooms and other localities during any
given period of time.
The improved apparatus chiefly comprises a long rod of copper or other metal
placed in the drying room etc. and allowed to expand and contract freely at one
end; a recording apparatus analogous to that of a steam engine indicator, and
mechanism for transmitting the motion of the free end of the copper rod to the
pencil of the recording apparatus.
To those elements may be added an automatic alarm apparatus adapted to sound
a bell by closing an electric circuit, when the temperature in the drying room.etc
exceeds a given limit.
The long copper rod may be suspended, supported on rollers, or otherwise secured
in the drying room, and it may be in contact with the malt or other material
contained therein, or it may be surrounded and shielded by a perforated tube.
The rod may also be solid or hollow.
In further describing the invention, reference will be made to the drawings filed
with the provisional specification, of which Fig. 1 is a side elevation, Fig. 2 a side
elevation with a partial section, and Fig. 3 a partial end elevation and Fig. 4 a plan
of a thermograph, suitable for measuring the temperature of malt drying rooms,
while the remaining figures represent details.
A metallic rod n, preferably of copper, is fixed at one end in the drying room
and projects with the opposite end into a box, which contains the recording instru-
ment. This rod n is in contact with one side p¹ of an angular plate p, suspended
at one end m from a vertically adjustable slide 7 and hinged at the other end o to
the short arm of a two-armed lever h
This lever has a slot h' and turns on a fulcrum or axle z¹, secured to a stand z,
while the long arm of the lever carries a pencil g, held in contact with a drum d,
adapted to receive a continuous rotary motion by means of a clock work e.
i is a regulating screw for the slide 1, guided in a bracket, fixed to the wall of
the casing; f is a lever, pivoted to a fixed stand and holding the upper journal of
the drum d; d' is the bottom plate of the drum, mounted on the main axle of the
clockwork. On the drum d is mounted a sheet of paper, divided into sections by
a series of parallel upright curves.
If the rod n expands by heat, the hinge o of the plate p will be raised, and the
pencil g lowered, as indicated in dotted lines by Fig. 2. Consequently, the pencil g
will describe on the revolving drum d a diagram, the horizontal distances of which
denote the time, while the ordinates or vertical distances denote the corresponding
temperature.

page_text: An elastic alarm apparatus may be combined with the thermograph, so as to ring
a bell, when the temperature of the drying room reaches a given limit.
This alarm apparatus may comprise a graduated arc S, hinged at v to a bracket t,
secured to the bottom of the casing by means of a screw u and carrying a movable
block adapted to come in contact with the lever h, when the latter reaches a certain
height and thereby closing the circuit of an electric bell.
and y are conducting wires, forming part of this circuit.
In the modification represented by Figs. 5, 6 and 7, the axis of the drum d
is horizontal, and the pencil g, held by an upright lever b, controlled by the
extremity of the rod n guided between rollers.
In Figs. 8 and 9, the marking sheet is not mounted on the circumference, but on
the face, of the drum d, and is divided into concentric circles. The pencil is held
by a rod f¹ suspended from a lever h, which is connected with the rod n by
a lever b and link c. The latter is made of two parts connected by a coupling h',
which serves to vary the length of the link.
In Figs. 10 and 11, the rod n acts on a piston enclosed in the cylinder e¹
containing a fluid, which serves to displace a smaller piston or weight in a tube d¹.
This weight is suspended from a string e passing over a pulley f2 and connected on
the other side with a rod m', which carries the pencil.
In Fig. 12, the copper rod G is made hollow and supported near the free end by
a roller H. It abuts against a set screw passing through the short arm of a lever B
suspended by means of a hinge joint from a rod rendered vertically adjustable by
a screw and nut D.
The long arm of the lever B is connected with the short arm of the pencil
carrier A by a flexible strap 61, for which purpose the contiguous arms of the
lever A and B are enlarged and curved concentrically to the pivots of the respective
levers.
Fig. 13 shows a thermograph in which the tracer and recording drum are situated
in the stoke hole.
The expanding brass tube N¹ is fixed at one end to an angle plate A¹ attached to
the floor iron work or to the kiln wall. This end is fitted with a long screw and
two nuts, by the adjustment of which the levers can be altered to suit the starting
point or lowest temperature. The other end of the tube carries a cylindrical or
hemispherical terminal, which bears against a spur & on the shaft of the double
armed horizontal lever C¹¹¹.
To the kiln wall is bolted a hollow casting M' provided with a face-plate m¹
which forms at the upper right and left hand corner a pair of bearings or horns
for the shaft of the two armed lever C¹. This rocking shaft is held between centres
formed by a pair of screws D¹ screwed into the said horns projecting upward from
the face plate m¹.
The extremity of the longer arm C of the double-armed rocking lever forms a
knife-edge bearing for a rod F¹ extending down into the stoke hole and connected
with the vertical sliding rod Fu operating the tracing pencil. Instead of the
rod F, a chain may be used.
The short arm C₁ of the rocking lever carries a counter-piece E¹.
An adjustment is necessary to secure the required range of the tracing pen, and
this is obtained by means of an adjustable guide plate B¹ which forms at the top &
bearing for the movable end of the tube N, and is secured to the face plate m¹ by
means of two screws 61 and 6", the screw b¹ passing through a vertical slot of the
plate B, so as to allow the necessary vertical adjustment.
To protect the vertical rod F1 (or the chain) from injury, an iron tube G passes
from an arm of the bracket M. through the intermediate floors down to the
recording instrument in the stoke hole.
The recording instrument chiefly comprises a tracer G attached to a horizontal
arm mounted on a vertical rod and movable up and down with the same;
a clock work surmounted by a drum H¹ which carries the recording sheet and
is turned by the clock work (for instance one revolution in 24 hours). This drum

page_text: is divided into rectangular panels by a series of horizontal and a series of vertical
lines, the vertical lines marking the hours, while the horizontal lines mark the
temperature, beginning at the bottom with 80° Fahrenheit, and increasing at
intervals of ten degrees up to 200 degrees. The sliding rod F1 must be guided in
a vertical line by any convenient means (not shown in the drawing) and is
connected with the lever C¹ by a connecting rod F, or a chain, so that the
Oscillating motion of the lever is converted into a proportionate rectilinear up
and down motion of the rod F
The automatic electric alarm may be controlled by the up and down motion of
the arm which carries the tracer, this arm being situated between two vertically
adjustable contact pieces, and adapted to close a circuit by coming in contact with
the upper or the lower one of the said contact pieces.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare, that, what
I claim, is:
1.) A thermograph comprising in its construction a long metallic rod or tube,
placed in the room, the temperature of which is to be recorded, and adapted to act
by its linear expansion on the pencil of the recording apparatus through suitable
mechanisin.
2.) The various forms of thermograph substantially as described and illustrated
by the drawings.
3.) The combination of a thermograph adapted to act by the expansion of a
long metallic rod or tube, with an automatic alarm apparatus, substantially as
described.