Improvements in Thermometers.
Year: 1891

page_text: Date of Application, 4th Dec., 1891
Complete Specification Left, 5th Sept., 1392-Accepted 15th Oct.
1802
PROVISIONAL SPECIFICATION.
Improvements in Thermometers.
I, JOHN DAWSON, of Mayfield, Milnrow, near Rochdale in the County of
Lancaster, Engineer do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in thermometers particularly applicable
to be used for indicating the temperature of wool-washing bowls, dye vats and for
other similar purposes and manufacturing processes and its object is to provide a
thermometer better adapted to stand the sudden changes of temperature to which
they are liable to be exposed.
For this purpose I form a collar on the glass thermometer tube at any convenient
part but preferably about one third of the length of the tube from the top. The
remainder of the tube is incased in metal preferably of annular section and said
collar rests upon the top of the casing and may have a thin india-rubber or other
suitable washer introduced between it and such casing. The tube is mounted in
the case by means of india-rubber washers which keep the tube central and to a
great extent deaden any blow liable to break the tube or bulb.
The scale is fitted above the said collar preferably in an enlarged continuation
of the casing and an index finger is provided arranged to be adjusted by a special
key or otherwise kept from being tampered with so that said finger may be set to
point out the temperature it is desired to raise the thermometer to.
Dated this 3rd day of December 1891.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Thermometers.
I, JOHN DAWSON, of Mayfield, Milnrow, near Rochdale, in the County of
Lancaster, 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 relates to improvements in thermometers particularly applicable
for indicating the temperature of wool-washing bowls, dye vats and for other
similar purposes and manufacturing processes and its object is to provide a
thermometer better adapted to stand the rough usage and sudden changes of
temperature to which they are liable to be exposed.
For this purpose I form a collar on the glass thermometer tube at any convenient
part but preferably about one third of the length of the tube from the top. The
remainder of the tube is incased in metal preferably of annular section and said
collar rests upon the top of the casing and may have a thin india-rubber or other
suitable washer introduced between it and such casing. The tube is mounted in
the case by means of india-rubber washers which keep the tube central and to a
great extent deaden any blow liable to break the tube or bulb.
The scale is fitted above the said collar preferably in an enlarged continuation
of the casing and an index finger is provided arranged to be adjusted by a special
key or otherwise kept from being tampered with so that said finger may be set to
point out the temperature at which it is desired to keep the thermometer.
Reference is to be had to the accompanying sheet of drawings forming a part of
Price 8d1

page_text: this Specification in which similar letters of reference indicate corresponding parts
in each of the figures.
Figure 1, is a front elevation of a thermometer constructed in accordance with
my invention mounted on the edge of a vat or wash bowl shown broken away.
Figure 2, is a side view of the thermometer.
Figure 3, is a vertical side section and Figure 4, is a sectional plan on the broken
line
b in the former figure.
a,
Figure 5, is a separate view of the thermometer tube with said collar and india-
rubber packing shown in section.
Figure 6, is a separate side view of the indicator plate with the indicator mounted
thereon.
The portion A of the casing within the vat B is tubular and the lower part
surrounding the bulb C is pierced with a number of perforations D to afford the
liquid in the vat free access to the surface of the bulb. The upper portion A² of
the case is enlarged to receive the scale E, the indicator finger F and the indicator
plate G and the front of the casing is formed by the glass plate H mounted in the
frame J and secured by the screws K.
Claws or feet I are formed at the bottom of A' adapted to be bolted to the
flange B of the vat to secure the thermometer in position.
The tube L is provided with a collar M either formed thereon or tightly
clamped in position this collar rests upon a seat N formed at the top of the tubular
portion of the case with the annular flange O of the india-rubber packing P
intervening between the said collar and seat. The packing P fits the upper end
of A and a second india rubber packing ring Q surrounding the tube immediately
above the bulb C fits the lower part of it. The tube is introduced to the casc
from the top through the aperture closed by the screw cap R.
The collar M is in the drawings represented as a split collar the two portions of
which are connected together and firmly clamped on the tube L by the screws S
but a glass collar may be formed on the tube itself.
The scale E is secured by the screws T to the back of the case A against
the cross webs U. And the indicator plate G is fixed in a similar manner by the
screws T against the cross webs U." The indicator finger F is fixed on the
block V fitting the guide slot W in the plate G and is adjusted by the traversing
screw X mounted in the lugs Y projecting from the back of the plate. The top
end of the screw X is made of square or other suitable section to receive a key to
turn the screw and an aperture is made in the case A³ closed by the screw cap Z
to admit the said key.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. Mounting or supporting a thermometer tube by a collar formed or secured
thereto resting upon an india-rubber covered seat, substantially as herein shown
and described.
2. The combination with a thermometer of an indicator finger enclosed within a
case, substantially as herein shown and described and for the purpose specified.
3. The particular form or construction of thermometer case herein shown and
described and illustrated in the accompanying drawings.
Dated this 2nd day of September 1892.
DRACUP & NOWELL,
Bradford, Agents.