Year: 1887

page_text: Date of Application, 10th Oct.,. 1887
Complete Specification Left, 10th July, 1888
Complete Specification Accepted, 17th Aug., 1888
I, ACHILLES DE KHOTINSKY of No. 67 Maskrade Rotterdam in the Kingdom of
Holland, Electrician, do hereby declare the nature of this invention, to be as
follows:-
This invention relates to apparatus for electrical measurements, also applicable for
breaking and making electrical contacts automatically.
The action of this apparatus is based upon the unequal expansion of different
metals; the essential part of the apparatus consists in soldering or otherwise fixing
together two or more strips of different metals to form a compound conductor,
through which the electrical current to be measured, is then caused to pass.
This compound conductor, by the passing of an electrical current, becomes heated
and the unequal expansion of metals of which it consists will cause a curvature of the
said compound conductor according to well known physical laws.
If one end of the said compound conductor is fixed, the other end will move
according to the heat developed in the conductor. This motion of the free end is
transmitted through sensitive levers or gearing arrangements to a pointer on a
graduated scale. The same method may be also applied to the automatic making
and breaking of contacts, for automatic safety contact apparatus, automatic registering
apparatus, and the like, the curvature and consequent motion of the free end of
the compound conductor due to the unequal expansion being utilised for making or
breaking a contact.
The compound conductor above described may be of any desired configuration and
transverse sectional form; thus it may be of rectilineal, spiral, helical, cylindrical or
conoidal shape and either of circular, polygonal or other section.
1
1007
ABEL & IMRAY,
Agents for the Applicant.

page_text: I, ACHILLES DE KHOTINSKY of No. 67 Maaskade, Rotterdam, in the Kingdom of
Holland, Electrician, 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 :-
This invention relates to apparatus for electrical measurements, also applicable for
breaking and making electrical contacts automatically.
The action of this apparatus is based upon the unequal expansion of different
metals; the essential part of the apparatus consists in soldering or otherwise fixing
together two or more strips of different metals to form a compound conductor,
through which the electrical current to be measured is then caused to pass.
This compound conductor, by the passing of an electrical current, becomes heated
and the unequal expansion of metals of which it consists will cause a curvature of the
said compound conductor according to well known physical laws.
If one end of the said compound conductor is fixed, the other end will move
according to the heat developed in the conductor. This motion of the free end is
transmitted through sensitive levers or gearing arrangements to a pointer on a
graduated scale. The same method may be also applied to the automatic making and
breaking of contacts for automatic safety contact apparatus, automatic registering
apparatus and the like, the curvature and consequent motion of the free end of the
compound conductor due to the unequal expansion being utilised for making or
breaking a contact.
The compound conductor above described may be of any desired configuration and
transverse sectional form; thus it may be of rectilineal, spiral, helical, cylindrical, or
conoidal shape, and either of circular, polygonal or other section.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
In apparatus for effecting electrical measurements and contacts, the use of a
conducting rod, bar, or plate included in an electrical circuit and formed of two
or more metals having different degree of expansion, the said rod bar or plate
being connected at one point of its length to a fixed support so that on passing
an electric current through it the resulting unequal expansion of the two metals
due to the heating will cause the end or ends thereof to move, which motion is
either communicated to an index on a measuring scale or caused to make or break
an electrical contact, substantially as herein described.
Dated this 10th day of July 1888
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