Improvements in Apparatus for Automatically Indicating Changes of Temperature.
Year: 1887

page_text: Date of Application, 14th Mar.. 1887
Complete Left, 12th Dec., 1887
Complete Accepted, 27th Jan., 1888
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Automatically Indicating Changes
of Temperature.
We HENRY ROBERT LANDON of 25 Alderville Road Fulham in the County of
Middlesex, Electrician, WALTER THOMAS WRIGHT THACKERAY of 50 Eccles Road.
Clapham in the County of Surrey, Engineer, and JOHN RICHARDSON of 173 Tufneli
Park Road Holloway in the County of Middlesex, Scientific Instrument Maker do
hereby declare the nature of this invention to be as follows:-
This apparatus consists, essentially of a reservoir of suitable shape in connection
with a
Bourdon tube, the reservoir and tube being filled with gas or liquid having
expansive properties; the free end of the Bourdon tube may be connected to a
lever for multiplying the motion caused by expansion or contraction of the liquid or
gas. The said fever can be made to pass over one or more electrical contacts in
connection with an electric bell or series of electric bells; or the said lever can be
arranged to relieve a spring, setting in motion a clockwork alarum or other mechanical
contrivance for the same purpose. By these means, for instance, can be signalled
any particular degree of expansion it may he desired to indicate, such as would
be caused by the heating of journals or bearings of steam or other engines or
machines, &c., or the same can be made to indicate the presence of fire in buildings,
ships, &c., &c.
T
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page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Automatically Indicating Changes
of Temperature.
We ESTELLE ISABEL LANDON, Widow and Executrix of Henry Robert Landon,
deceased late of 25 Alderville Road Fulham in the County of Middlesex Electrician.
WALTER THOMAS WRIGHT THACKERAY, of 80 Eccles Road Clapham in the County
of Surrey Engineer and HARRIET RICHARDSON, Widow and Administratrix of John
Richardson, deceased late of 178 Tufnell Park Road Holloway in the County of
Middlesex, Mathematical Instrument Maker, 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 -
22
This apparatus consists essentially of a reservoir of suitable shape in connection
with a
Bourdon tube. the reservoir and tube being filled with gas or liquid having
expansive properties. The free end of the Bourdon" tube may be connected to a
lever for multiplying the motion caused by expansion or contraction of the liquid or
gas, the said lever can be made to pass over one or more electrical contacts in connection
with an electric bell or series of electric bells or the said lever can be arranged to
relieve a spring, setting in motion a clockwork alarum or other mechanical contrivance
for the same purpose.
By these means, for instance, can be signalled any particular degree of expansion
it may be desired io indicate, such as would be caused by the heating of journals or
bearings of steam or other engines, &c., or the same can be made to indicate the
presence of fire in buildings, ships, and the like.
In order that the invention may be clearly understood, reference is made to the
accompanying drawings which form part of this specification, and in which :-
Fig. 1 represents a front elevation.
Fig. 2 a plan of the apparatus fitted to a journal bearing, and adapted to operate
the desired signal by means of electrical connections, and--
Fig. 3 a front elevation of a connecting rod head of a marine engine, with the
apparatus fitted to the upper brass thereof and in connection with a combined electric
battery and bell attached to the rod. We do not however confine ourselves to these
particular uses of the apparatus.
The reservoir A is filled with gas or liquid having considerable expansive properties
under the action of heat and is connected to the "Bourdon" tube a, the free end of
which is attached to the slotted and adjustable lever b, the length of which is regulated
by set screw 6. The outer end of lever is attached at any desired point to pivoted
contact maker d, the free end of which is shown in full lines as resting on insulating
piece e which may be of vulcanite or other suitable material. Any heating of
bearing B would impart heat to reservoir A, the result being the movement of tube a
with connected levers b, d, the latter being drawn over on to contact piece, as
indicated by dotted lines, and the circuit being completed through the terminals g, g

page_text: an electric bell or other alarm will be sounded. It will be obvious with apparatus
construcied as described that contact piece must not be in electrical communication
with both terminals except when lever d rests thereon, and to this end said contact.
piece is insulated from the metal casing by being screwed into a recess in the face of
the insulating block e, a wire serving to complete the communication with the
terminal 91 the other terminal being of course in connection with the casing, the
Bourdon tube and levers b, d.
It will be also obvious that lever d may be used to liberate a spring, setting in
motion a clockwork alarum or other mechanical contrivance for the same purpose, but
we prefer the construction shown in the drawings.
We consider the apparatus especially valuable for use on marine engines as when
the connecting rod is in motion it is always difficult to ascertain if the brasses are
heating. We therefore employ the arrangement shown in Fig. 3 and insert the
reservoir tube A in preferably the upper brass B and carry the connecting wires to a
combined portable bell and battery attached to the rod, though it is obvious that
the bell may be at some stationary point if a sufficient length of loose wire is
provided.
We are aware that it is not new to utilize a "Bourdon" tube for the purpose
of indicating the heating of bearings and we make no broad claim thereto but
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
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1st. In apparatus for automatically indicating a change of temperature, the
combination with a Bourdon tube of a reservoir A filled with gas or liquid having
expansive properties when even slightly heated and an indicating alarmi apparatus
substantially as set forth.
2nd. In apparatus for automatically indicating a change of temperature the
combination with a Bourdoniube of lever badjustably connected with lever d
substantially as and for the purposes set forth.
Dated this 10th day of December 1887.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London,
Agent for the Applicants.