Improvements in Self Registering Thermometers.
Year: 1892

page_text: Date of Application, 29th Dec., 1892
Complete Specification Left, 1st Sept., 1893-Accepted, 7th Oct., 1893
PROVISIONAL, SPECIFICATION.
Improvements in Self Registering Thermometers.
I, FRANK COSSOR of 15 Clerkenwell Green, in the County of Middlesex, Glass
Blower, do hereby declare the nature of this invention to be as follows:-
In self registering thermometers as formerly constructed there was a liability for
the index to pass into the bulb, in order to prevent this the tube has been latterly
bent or cranked closely adjacent to the bulb but in this case in the event of
anything going wrong with the index it was difficult or almost impossible to put the
thermometer right. Another method of preventing the index from passing into
the bulb was by sealing a glass splint in the end of the bulb the free end of which
splint entered a short distance into the tube, now although this plan prevented the
passage of the index into the bulb and facilitated the repair of the thermometer
the latter was very liable to injury from the breaking of the glass splint.
According to my invention I am enabled to prevent the index from passing into the
bulb and at the same time facilitate the repair of the thermometer which latter is
also secure against injury to the means for retaining the index in the tube.
In carrying my invention into effect I form in the bore of the tube closely
adjacent to the bulb an enlargement of such a shape that it will permit of the
ready insertion therein of a suitable stop and will retain such stop in position which
stop will prevent the accidental passage of the index from the tube into the bulb.
The form of enlargement I have found to answer well has the end thereof
adjacent to the bulb made of as sharp an angle as possible and the bore passing
therefrom to the bulb is somewhat larger than the general bore of the tube whilst
the end of the enlargement opposite to that hereinbefore referred to tapers or curves
gradually or easily into the normal bore of the tube. The stop I have found to answer
is preferably made of glass, it has a head at the end adjacent to the bulb, a neck
connecting such head to the body and a slight enlargement at the end adjacent to
the normal bore of the tube, a bristle is tied around the neck so as to cause the
ends thereof to spring outwards. This stop can be passed readily from the bulb
into the said enlargement and when in position it is retained therein by the bristle
springs before referred to bearing against the sharply angled end of the
enlargement but such stop cannot on account of its size pass into the bore of
the tube.
From the above it will be seen that the index cannot pass from the tube into the
bulb as the stop will prevent it but if for any purpose it should be required to get
at the index the end of the bulb can be opened and then by a small hook passed
under the bristle the stop can be removed when the index will readily pass out of
the tube.
I would have it understood that the form of the enlargement in the tube and the
form and construction of the stop can be somewhat varied without departing from
the peculiar character of my invention.
Dated December 29th 1892.

page_text: COMPLETE SPECIFICATION.
Improvements in Self Registering Thermometers.
I FRANK COSSOR of 15 Clerkenwell Green in the County of Middlesex Glass
Blower 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 improvements in self registering thermometers the object
of my said invention being hereinafter explained.
In self registering thermometers as formerly constructed there was a liability
for the index to pass into the bulb and in order to prevent this the tube has been bent
or cranked closely adjacent to the said bulb but in this case should repair be necessary
at any time it was difficult or almost impossible to effect the said repair. Another
method of preventing the index from passing into the bulb was by sealing a glass
splint in the end of the bulb the free end of which splint entered a short distance
into the tube.
Now although this latter plan prevented the passage of the index into the bulb.
and facilitated the repair of the thermometer the latter was very liable to injury
from the breaking of the glass splint.
☐ My invention is devised to overcome these objections and in order that my
invention may be better understood reference is made to the accompanying
drawings in which I have illustrated the manner of carrying my invention into
effect and in which
Fig. 1. is a tube of a thermometer partly in section shewing the bulb and the
enlargement of the bore hereinafter referred to.
Fig. 2. is the stop which is inserted in the bore drawn to an enlarged scale and
Fig. 3 shews the complete device.
In the bore a of the tube A adjacent to the bulb 6 I form an enlargement as
shewn at c of such a shape that it will permit the insertion therein of a suitable
stop d (shewn in Fig. 2) and will retain the said stop in position thus preventing
the accidental passage of the index e from the tube into the bulb b. The form of
the enlargement I prefer to make is that shewn in the figures from which it will be
seen that the end thereof adjacent to the bulb is made of as sharp an angle as
possible the passage thence into the said bulb being of a slightly enlarged area than
that of the bore of the tube. The end of the enlargement opposite to that before
referred to contracts or tapers gradually into the normal bore of the tube.
The stop d which is preferably made of glass has a knob or head fat the end
adjacent to the bore a neck connecting such head to the body and a slight
enlargement g at the end adjacent to the bulb. A bristle stiff hair or other flexible
and elastic filament h is tied or otherwise fastened around the neck in such a
manner as to cause the ends thereof to spring outwards and project upon either side
of the stop as shewn. This stop d can be passed readily from the bulb 6 into the
said enlargement c and when in position it is retained therein by the elastic
filament before referred to bearing against the sharply angled end of the
enlargement c but the said stop cannot by reason of its size pass into the bore of
the tube.
From the foregoing description it will be seen that the index e cannot pass out of
the bore of the tube into the bulb as the stop d will prevent it but if for any
purpose it should be required to get at or remove the said index the end of the
bulb b can be opened and then by a small hook passed under the elastic filament h
the stop can be removed thus allowing the index to readily pass out of the tube.
I wish it to be understood that the form of the enlargement c in the bore and
the form and nature of the stop may be varied without departing from the spirit of
my invention.

page_text: 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. In a self registering thermometer the manufacture and use of a removable
stop adapted to prevent the index passing into the bulb of the instrument the said
stop being retained in position by a flexible or elastic filament engaging an
enlargement of the bore the whole constructed and arranged substantially as
described and illustrated.
2. The combination with the tube and bulb of a self registering thermometer of
a removable stop adapted to prevent the index passing into the said bulb, an
elastic filament attached to said stop and an enlargement in the bore of the tube to
receive the ends of said filament and thus prevent the accidental displacement of
said stop the whole being combined arranged and operating substantially as
described and illustrated.
Dated this 31st day of Anost 1893
FRANK COSSOR,
Applicant.