Improvements in Thermometers.
Year: 1895

page_text: Date of Application, 18th Oct., 1895
Complete Specification Left, 20th July, 1898-Accepted, 22nd Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Thermometers.
I ALEXANDER LURASCHI, of 16, Cross Street, Hatton Garden, in the City
of London, Glass Blower, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in thermometers, aud has for object to
produce a thermomoter of the kind known as "minimum," that can be used in a
vertical position, and that will be easy of rending, not liable to get out of order,
and capable of ready setting.
In carrying the invention into practice, I provide a single sealed tube of the
usual construction containing a liquid and having a bulb at one end, such tube in
addition containing an index having a glass spring of the usual form for retarding
its movement within the bore of the tube.
It is understood that the thermometer is used in a vertical position, so when it
is desirable to move the index towards the upper end of the bulb, should such
index have fallen considerably through the lowness of the temperature, the tube
is reversed, that is to say, the bulb end is held uppermost, which causes a weight,
preferably in the form of a thin glass or other rod contained within the tube, to
travel from its normal position at the bulb end of such tube, and to force the
index aforesaid to the desired altitudo.
I preferably employ a colourless spirit within the thermometer above described,
in order that the position of the index can be more readily ascertained, than whero
a coloured liquid is used.
Dated this 18th an Ontahan 2008
HUGHES, SON & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
. Improvements in Thermometers.
I ALEXANDER LURASONI, of 16, Cross Street, Hatton Garden, in the City of
London, 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 thermometers, of that class known as '
"minimum" and has for its object to provide a non-mercurial thermometer of
this kind that can be used in a vertical position and be easy of reading, while
at the same time it is not liable to get out of order and is capable of ready
.setting.
Hitherto the generality of minimum thermometers have been so constructed
as to be only capable of being used horizontally, and as is well known this
horizontal form possessed many disadvantages which it has been my aim to
overcome.
•

page_text: I am also aware that some minimum thermometers have been constructed that
can be used vertically, but owing to the necessity of employing mercury as well
as spirit in the tubes (which rendered them greatly linble to get out of order), and
to the inconvenience of their general arrangement, their use has been practically
discontinued.
Now my invention provides for a vertical minimum thermometer in which spirit
only and no mercury is employed and that will accurately register the lowest
temperature that has been reached during any given period in such a manner that
anyone can ascertain such fact at a glance.
This thermometer, unlike others, can be carried from place to place without
fear of disturbing the index and so preventing the minimum temperature being
ascertained.
In order that this my said invention may be the more readily understood and
carried into practical effect, refer nce is hereby made to the accompanying sheet
of illustrative drawings in which:-
-
Fig. 1 is an elevational view of a thermometer tube containing the index, and
means for setting same, constructed according to my invention, and
Fig. 2 a view of the setter or plunger aforesaid.
a is a single scaled thermometer tube of ordinary construction, the bulb end a¹
in use being the lower end. Tho said tube a contains a spirit, which may be
coloured or otherwise and an index b having a glass or other spring (not shown)
of the usual form for retarding the upward movement within the bore of the
tube a.
The latter also contains the means for setting the index, consisting of a
glass or other rod or plunger c of suitable length and circumference, capable of
sliding freely within the bore of the said tube.
In operation, when it is desired to move the index b towards the upper end of
the tube a, to set the thermometer ready for a fresh reading, the thermometer is
reversed, that is to say, the bulb end a' is held uppermost, which causes the
Better or plunger & to travel from its normal position in the bulb a', and to force,
by its weight, the said index b to the farthest limit of the spirit a'.
After the index has been set at the upper extremity of the spirit, it will
gradually sink as the temperature becomes lower, by the action of the spirit
contained within the tube contracting, but will not rise should the temperature
increase, therefore in order to ascertain what has been the lowest degree the
temperature has reached since the thermometer has been set, all that is necessary
is to see in what position the index is.
My improved thermometer is employed in conjunction with a back ground of
the usual form, not shewn upon the drawings.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. The improvements in minimum thermometers, substantially as described and
illustrated.
2. In a non-mercurial minimum thermometer to be used in a vertical position,
baving an index controlled by the contracting of the spirit contained within the
tube, a plunger for setting the index, substantially as described and illustrated
by the drawings.
Date o 1