Improvements in Temperature Regulators, applicable also for Thermometric Purposes.
Year: 1899

page_text: Date of Application, 11th Nov., 1899-Accepted, 27th Jan., 1900
Improvements in Temperature Regulators, applicable also for
Thermometric Purposes.
I, JOHN MANN, of 8, Shaftesbury Terrace, Shaftesbury Road, Romford, Essex,
Engineer, 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:-
This invention for improvements in temperature regulators has for its object
an improved construction of temperature regulator by which very minute vari-
ations of temperature will raise or lower a damper for regulating the heat from
a heating lamp imparted to an air current circulating within an incubator or
other apparatus for which the temperature regulator is employed.
And in order that this invention may be more clearly described, reference is
had to the accompanying sheet of illustrative drawings on which
Fig. 1 shows in elevation the general construction of the regulator,
Fig. 2 is a plan of the same, and
Figs. 3 and 4 are detail views.
At a suitable position the rod A is supported. This rod is of mica, asbestos,
slate or other similar material which does not expand under the influence of heat.
Towards each end of this rod A the rods B B B are attached at aa the other
ends meeting in the centre as shown. These bars B B B Bare of channel section
and are preferably of charcoal iron or other material having a very uniform rate
of expansion under the influence of heat.
At the point of contact of the rods B B' at one side a small piece of sheet
metal C (shown separately in Fig. 4) is fitted. This piece C is cut away at one
side as shown at and is preferably sharpened at the edge which fits between
the ends of the rods B B¹ in contact. At the point of contact of the rods B B¹
at the other side a small nut or the like is provided fitting upon a wire E
which passes between the ends of the rods B B in contact. The other end of this
wire E is attached at e to one end of a long lever F. This lever fits in the cut
away portion of the piece C so as to bear on one of the edges of the said cut
away portion c and the point where it engages therewith is very close to the point
of attachment c of the wire E.
At its other end this lever F is attached to the rod G connected by the adjust-
ing screw to the lever H as shown. This lever H is pivotted by means of the
points h h upon the screws supported in the brackets I I so that it is very
sensitive. The balance weight J is adapted to slide upon the shorter arm of the
lever II and can be adjusted in any desired position by means of the adjusting
screw j. The rod L is attached by means of the screws and this is connected
by mechanism of a usual character to the damper of the lamp the heating effect
from which is to be regulated.
As the temperature rises the bars B B B B' expand and as the rod A is of

page_text: non-expansible material the points of contact between each of the rods B B
will tend to move outwardly further from the rod A. The point e will then by
means of the wire E be drawn nearer to the rod A while by means of the engage-
ment of the piece between the ends of one set of the bars B B there will be a
tendency to it the lever F further away from the rod A. The combination of
these drawing towards and forcing away movements operating at points so close
together will cause a considerably magnified rising movement of the other end
of the lever F. This will act by means of the rod to force upwards the corre-
sponding side of the lever H and this movement transmitted by means of the
rod will lift the damper from over the lamp to allow of the heat escaping thus
reducing its heating effect therefore lowering the temperature within the incu-
bator or other apparatus for which the regulator is used to its normal level.
In a similar manner the contruction of the bars B B B B will have a reverse
effect so that as soon as the temperature has fallen sufficiently the damper will
be lowered again.
It will be seon that by this construction an extremely sensitive regulator is
provided. The expansion of the rods B B B B which is really very small indeed
is magnified very greatly to give the desired effect.
This temperature regulator is especially designed for incubators in which case
it is preferably arranged across the contre of the egg tray and the outer end of the
rod is connected by a cord to the damper over the lamp arranged at the side
of the incubator.
This regulator is also applicable in other circumstances where a uniform tem-
perature has to be maintained and by arranging the outer end of the rod L to
move over a graduated scale can even be employed for thermometric purposes.
The wire E and the rod G are preferably specially prepared by strongly heat-
ing and when in this expanded condition amalgamating with silver and mercury
so that they become practically non-expansible under heat.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, 1 declare that what I
claim is:-
(1) In a temperature regulator, a rod of material which does not expand under
the influence of heat, two series of rods of a material which expands under the
influence of heat attached at one end of the non-expansible rod and their other
ends of each set being in contact so that expansion under the influence of heat
will cause these ends to move outwardly and contraction will cause an inward
movement, a lever connected at one point to one of these points of contact and
by means of a wire to the other point of contact these two points of attachment
being very close together, a link connecting the other end of this lever to one
arm of a balanced lever the movement of which raises or lowers the damper over
the heating lamp, to reduce or increase the heating effect substantially as described
(2) In a temperature regulator, a rod of material which does not expand under
the influence of heat, two pairs of rods of a material which expands under the
influenco of heat connected at one end to the non-expansible rod and having the
free ends of a rod from each set in contact, a slotted piece of metal fitting between
the two ends of one pair of these rods so that expansion will cause it to move out-
wardly, a wire connected to the point of contact of the other two rods, a lover
fitting into the cut away portion of said piece of metal, and attached and an
adjacent point to said wire so that the two points of action are very close together
and a link connecting this lever to one arm of a balanced lever the movement of
which raises or lowers the damper over the heating lamp to reduce of increase
the heating effect, substantially as described and for the purposes specified.
(3) In a temperature regulator, the rod A of a material which does not expand
under the influence of heat, rods B B B B' of a material which expands under the
influenco of heat, piece C having portion cut away at c amalgamated, wire E
baving a nut D, lever l' attached at e to the wire E and fitting into the cut away

page_text: and ex-
portion of the piece C amalgamated, rod G, lever H, balance weight
tension rod L connected to the damper over the heating lamp, all arranged and
operating substantially as described and for the purposes specified.
Dated this 11th day of November 1899.
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.