Year: 1896

page_text: HENRY ROBERT JOHN BURSTALL and HENRY FREDERIC WILLIAM
BURSTALL of 76 King's Road Camden Road London N.W. Civil Engineers do
hereby declare the nature of this invention to be as follows:-
The construction of an electrical resistance thermometer in which the wire
(whose change of resistance is a measure of the temperature) is carried by stout
metallic wires from a base or support, which may form the means by which the
thermometer is inserted into or fixed to the vessel whose temperature is to be
measured. The wire is wound between two or more strips of insulating material,
preferably mica, forming a coil; the strips of insulating material being attached to
the supporting wires by screws or other suitable fastenings.
Proper provision is made, by slots in the mica or supports for tightening up or
slacking off the wire by shifting the insulating strips on the supporting wires.
The supporting wires may form the electrical connections to the measuring wire
and in that case would be passed through the base, being insulated from it by
suitable rings or bushes. In thermometers for insertion into vessels in which there
is a pressure above or below that of atmosphere the bushes are replaced or supple-
mented by stuffing boxes to prevent leakage round the wires. The change of
resistance of the measuring wire may be measured by any usual resistance
measuring method, by the method of fall of potential or directly by any suitable.
instrument or apparatus.
Dated this Twenty-seventh day of January 1896.
HENRY ROBERT JOHN BURSTALL.
HENRY FREDERIC WILLIAM BURSTALL.
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HENRY ROBERT JOHN BURSTALL and HENRY FREDERIC WILLIAM
BURSTALL of 76 King's Road, Camden Road London, N.W. Civil Engineers 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 construction of an electrical resistance thermometer in which the wire
(whose resistance is a measure of the temperature) is carried by stout metallic
wires from a base or support, which may form the means by which the thermometer
is inserted into or fixed to the vessel whose temperature is to be measured. The
wire is wound between two or more strips of insulating material, preferably
mica, forming a coil; the strips of insulating material being attached to the
supporting wires by screws or other suitable fastenings.

page_text: Proper provision is made by sluts in the mic or supports for tightening up or
slacking off the wire by shifting the insulating strips on the supporting wires.
The supporting wires may form the electrical connection to the measuring wires,
and in that case would be passed through the base, being insulated from it by
suitable rings or bushes. In thermometers for insertion into vessels in which there
is a pressure above or below that of atmosphere, the bushes are replaced or
supplemented by stuffing boxes to prevent leakage round the wire. The change
of resistances of the measuring wire may be measured by any usual resistance
measuring method, by the method of fall of potential or directly by any suitable
instrument or apparatus.
The wire is coiled on strips of insulating material m m, proper serrations being
provided in which to wind the wire. The insulating strips are attached by screws
or other fastenings to the standards or supporting wires ss, proper slots being made
in the standards or the strips to allow the wire to be tightened up by moving the
strips. These standards may either be directly fastened into a base b or preferably
may pass through the base being insulated from it by bushes of insulating material,
in this case the terminals of the coil may be attached, one to each supporting wire,
at t, making them the main leads of the instrument. In thermometers used for
obtaining the temperature of vessels in which there is a pressure or vacuum the
washers are replaced by suitable stuffing boxes, one form of which is shown at ..
For protection of the bare wire a gauze cap e may be attached to the base.
Terminals may be attached to the ends of the supporting wires for attachment
of the wires to the apparatus for measuring resistance.
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 :-
(1.) In the construction of thermometers, in which the change of electrical
resistance of a wire is used to measure the temperature of the space in which the
thermometer is placed, the carrying & supporting of the measuring wire by means
of insulating strips fixed to and between standards or wires carried from a suitable
base.
(2.) The use of the standards or wires carrying the insulated strips as the main
leads from the measuring wire to the terminals, the standards, in this case, being
insulated from the base.
(3.) The construction of electrical resistance thermometers substantially as
above described and shown.
Dated this 28th dow of October 1896
HENRY ROBERT JOHN BURSTALL.
HENRY FREDERIC WILLIAM BURSTALL.