Improvements in Thermometers and Barometers.
Year: 1893

page_text: Date of Application, 15th Dec., 1893
Complete Specification Le t, 14th Aug.. 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Thermometers and Barometers.
I, SIDNEY RICHARDSON, of 356 Brixton Road, in the County of Surrey,
Optician do hereby declare the nature of this invention to be as follows:-
The first part of this invention relates to improvements in that class of thermo-
meter which has a tube, the bore of which contains mercury, spirit acid, or other
matter, together with an index which moves up and down within the bore, enabling
a register of the temperature to be kept.
The improvement consists in an additional bore, or bores, being made in the
tube, each containing a further index, or further indices, which when accurately
set, registers, or register the temperature which the first index registered, one, two,
or three days previously.
The second part of this invention relates to improvements in that class of
barometer which is provided with a tube which has a bore containing a column of
mercury, indicating the pressure of the atmosphere.
The improvement consists in two additional bores being made in the tube, in
each bore of which is placed an index moving.freely up and down within the bore,
by aid of a magnet, or other power, which indices, when accurately set, enable a
register to be kept, of the pressure, of the atmosphere, of one or two days
previously.
Dated this 15th day of December 1893.
SIDNEY RICHARDSON.
COMPLETE SPECIFICATION.
Improvements in Thermometers and Barometers.
I, SIDNEY RICHARDSON, of 356 Brixton Road, in the County of Surrey,
Optician, 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 :-
The first part of this invention relates to improvements in those classes of
thermometers which have a tube, the bore of which contains mercury, spirit, acid,
or other thermometric fluid, together with an index which is moved up and down
within the bore to enable a register of the temperature to be kept.
The improvement consists in making an additional bore or bores in the tube,
each containing a further index, which, when accurately set, will register the
temperature which the first index registered one, two or three days previously.
This part of my invention is illustrated in the accompanying drawing, Fig. 1 of
which is a face view of a Six's thermometer provided with my improvements, and
Fig. 2 represents a cross section of the two tubes thereof.
a a' represent the thermometric bores containing any suitable thermometric fluid
and indices 6 b' of any ordinary or well known description, and c c¹ represent
additional bores made within the same tubes as those containing the bores a a¹ and
containing other indices d d'.
The thermometric bores a a¹ communicate with the bulb e and expansion
chamber, and are connected together at their lower parts, being made from a
single tube bent at the middle of its length as is well understood. The additional
bore c is closed at its upper end, that is to say, it does not communicate with the

page_text: e
bulb but at its lower end it communicates with the lower end of the additional
bore c', which latter communicates with the expansion chamber f.
In using such a thermometer, after the indices bb' have been caused to register
by the action of the temperature, the additional indices d d' are made to correspond
with bb; then, on the latter moving at a subsequent period, comparison can be
made between such indices bb and the indices d d recording previous positions of
the thermometric columns. It will be evident that my invention is equally
applicable to a single tube thermometer.
The second part of this invention relates to improvements in that class of
barometer which is provided with a tube which has a bore containing a column of
mercury indicating the pressure of the atmosphere.
The improvements consist in making one or two additional bores in the tube, in
each of which additional bores is placed an index capable of being moved freely up
and down within the bore by aid of a magnet, which index or indices, when
accurately set, enable a register to be kept of the pressure of the atmosphere of
one or two days previously.
The barometer tube is made in similar manner to that for a thermometer, the
additional bore or bores being smaller than the barometric bore. I have therefore
not illustrated this part of my invention as such will be readily understood from
the description herein before contained.
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. A thermometer formed of a tube having one or more bores additional to the
thermometric bore and provided with an additional index or additional indices,
substantially as herein shown and described and for the purpose stated.
2. A barometer formed of a tube having one or more bores additional to the
barometric bore and provided with an additional index or additional indices,
substantially as herein described and for the purpose stated.
3. The improvements in thermometers and barometers substantially as herein
described and for the purpose stated.
Dated this 14th day of August 1894
SIDNEY RICHARDSON,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.
SIDNEY RICHARDSON,
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.