Year: 1887

page_text: Date of Application, 12th Nov., 1887
Complete Specification Left, 10th Aug., 1888
Complete Specification Accepted, 19th Oct., 1888
I, JOHANN SUDMANN of Hamburg, in the Empire of Germany, Manufacturer of
Optical and Mechanical Instruments, do hereby declare the nature of this invention
to be as follows:-
:—
My invention relates to that class of thermometers in which the change of tempera-
ture in the surrounding air is ascertained by the unequal expansion of different metal
strips soldered together.
The objects of my said invention are, first, to afford means for securing the invariable
transmission of the deflection of the compensating strips upon the dial-work inde-
pendently of the position of the thermometer; second, to provide straight compensating
strips for the thermometer; third, to arrange the driving mechanism independently
of the dial-work for the purpose of employing if desired a uniformly divided scale in
the thermometer; and fourth, to provide means for adjusting the pointer without
influencing the driving mechanism.
The thermometer is provided with two straight compensating strips in case the
instrument is to be used for scientific observations, while for ordinary use one strip
only will be sufficient. These compensating-strips are secured at one end to brackets
on a frame of the driving mechanism and connected at their free ends by suitable
pitmen with a crank-plate or driving-disc which transmits the deflection of the
compensating strips to the dial-work. The motion of the said driving disc pivoted in
a bracket of the said frame is transmitted upon a sector acting upon a pinion on the
spindle of the pointer by means of a pair of fork-shaped drivers into which engages
a pin adjustably guided in a notch of the said sector.
In order to adjust the pointer without affecting the driving mechanism, the frame
of the dial work is mounted on a separate bed-plate fixed to the case of the thermometer,
while the aforesaid frame of the driving mechanism is adapted to swing around a
pivot of the stationary bed-plate. The declination of the centre-line of the frame of
the driving-mechanism from that of the said bed-plate may be governed by an eccentric
or a similar device from the outside of the thermometer-case. As the said frame of

page_text: the dial-work is firmly connected with the stationary bed-plate the frame of the driving
mechanism will turn around the former. In consequence thereof the said fork-shaped
driver of the crank disc will take with it the adjustable pin acting upon the sector
and the pinion on the spindle of the pointer and thus turning the latter forward or
backward.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.
Improvements in Thermometers.
I, JOHANN SUDMANN, of Hamburg, in the Empire of Germany Manufacturer of
Optical and Mechanical Instruments, 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:-
My invention relates to that class of thermometers in which the change of temperas
the prequal point met d
strips subtered together.
The objects of my said invention are, first, to afford means for securing the
invariable transmission of the deflection of the compound strips upon the dial-work
independently of the position of the thermometer, second, to provide straight com-
pensating strips for the thermometer, third, to arrange the driving mechanism
independently of the dial-work for the purpose of employing throughout a uniformly
divided scale and to regulate the degree of oscillation of the pointer in accordance
with the division of the dial-plate or scale in the thermometer; and fourth to provide
means for adjusting the pointer without influencing the driving mechanism.
I attain these objects by the mechanism illustrated in the accompanying drawings
in which
Figure 1 is a front view of the thermometer with the scale removed.
Figure 2 is a side elevation of the thermometer partly in section.
Figure 3 is a detail.
Figure 4 is a similar view to Figure 1 but with the pointer in a different position.
Figures 5, 6, 7, 8 and 9 are details of the mechanism.
Similar letters refer to similar parts throughout the several views.
The thermometer shown in the drawings is provided with two straight compound
strips ec, which are to be preferred in case the instrument is to be used for scientific

page_text: observations, while for ordinary use one strip only will be sufficient. These compound
strips are secured at one end by means of screws to the brackets a and a¹ of the
frame A and connected at their free ends b¹ by the links e e¹ with the crank plate
or driving disc d, which transmits the deflection of the compound strips to the dial-
work. The motion of the disc d, pivoted in the bracket f of the frame A is transmitted
upon the sector i and the pinion k on the spindle of the pointer Z by means of a
pair of fork-shaped drivers c c¹ into which engages the pin adjustably guided by the
screw h in a notch of the sector i.
As the motion imparted to the driving disc by the deflection of the compound strips
is uniform throughout (as far as the deflection of the compound strips may be con-
sidered as increasing continuously and in direct proportion with the augmentation
of the temperature of the surrounding air) the division of the scale can be made equi-
distant and independent of the dial work, provided, that the degree of oscillation of
the pointer can be adjusted. However the adjustment may be easily effected by
varying the distance of the pins t of the said driving disc in relation to the centre
of oscillation of the latter. But when employing two compound strips a uniform
radial movement of both the pins t will be necessary and therefore underneath the
driving disc da corresponding disc d¹ is jointed which is provided (equidistant from
the centre of the driving disc) with two slots u crossing the radial slots of the
driving disc d into which engage the pins t, and it will be clearly understood from
the drawings (Figure 7 and 8) that the turning of the lower plate d¹ relatively to the
disc d, will cause the pins t to move uniformly in the radial slots of driving disc d.
Thus the distance from the centre of oscillation of the pins t which are connected by
the links
e with the compound strips, may be varied within certain limits and con-
sequently the angle of oscillation of the drivers c. c¹ and of the pointer may be easily
regulated in accordance with the scale of the dial-work.
e,
In order to adjust the pointer without affecting the driving mechanism the frame p
of the dial work is mounted on a separate bed-plate B fixed to the case of the
thermometer, while the frame A with the driving mechanism is adapted to swing
around a pivot n of the said stationary bed-plate B. The declination of the centre-
line of the frame A from that of the bed-plate B is governed by an excentric o
(Figure 3) or a similar device from the outside of the thermometer-case. As the
frame p of the dial-work, by means of the pin or stud excentrically arranged to
the pivot n, is firmly connected with the stationary bed-plate B, the frame A will
turn around the pivot n under the influence of the excentric o engaging into a notch s
of the frame A. In consequence of the turning of the frame of the driving work
independently from the stationary frame of the dial-work the fork-shaped driver c, c¹
of the crank disc d will take along with the pin acting upon the sector i and the
pinion k on the spindle of the pointer and thus turning the latter correspondingly
forward or backward.
said
Having now particularly described and ascertained the nature of my
invention and in what manner the same is to be performed I declare that what
I claim is:
First. In a metallic thermometer the combination of one or more straight compound
strips with the driving disc d substantially as specified and for the purpose of
the invariable transmission of the deflection of the compound strips upon the
dial-work.
c¹ of
Second. The combination in a metallic thermometer having one or more straight
compound strips of the driving disc d provided with the fork-shaped drivers
the adjustable pin l, the sector i, pinion k and pointer Z, substantially as set forth and
for the purpose of obtaining a throughout uniform scale on the dial plate.
Third. In a metallic thermometer the combination of the pins with the driving
disc d, having radial slots v, the movable plate d', provided with slots u crossing
those of the driving disc, the link e e¹ and the compound strips, substantially as set
forth and for the purpose specified.

page_text: Fourth. In a metallic thermometer the combination of the movable frame A of
the driving mechanism, with the stationary bed-plate B carrying the dial-work,
substantially as described and for the purpose specified.
Fifth. In a metallic thermometer having the driving mechanism secured to a
movable frame A and the dial-work mounted on a stationary bed-plate B the com-
bination of the excentric o, with the said stationary bed-plate and the said movable
frame A, substantially as set forth and for the purpose specified.
DAL
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.