Improvements in Insulation and Cooling of Electrical Inductoria.
Year: 1890

page_text: Date of Application, 12th Mar.; 1890
Complete Specification Left, 31st Oct., 1890-Accepted. 12th Mar., 1891
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PROVISIONAL SPECIFICATION.
Improvements in Insulation and Cooling of Electrical Inductoria.
LAZARUS PYKE & HARRY THEODORE BARNETT, Electrical Engineers,
Canterbury Works, Blenheim Terrace, London, N.W., do hereby declare the nature
of this invention to be as follows:-
:-
These improvements relate to coils for sparking & other purposes & high tension
& other electrical power converters.
We construct the apparatus with all or as much as possible of the mechanical
insulation of a permeable character, such as paper and after being thoroughly dried,
we place same in a container and complete the insulation by pouring in a liquid
insulator, such as paraffin (which we prefer), which may have. first been dried, by
passing through a filter of powdered potassium, or by some other convenient method.
We may provide a space in container for this material, that the insulator may be
maintained permanently free from moisture.
The transformer is so arranged, that the liquid insulator, may have as much
facility for circulating round and through same as is necessary to keep down the,
temperature, and again to cool the liquid insulator in its turn, we so arrange the
container that it may offer sufficient surface for this purpose and to this end we may
corrugate or otherwise extend the surface of the same and may add lugs or
projections, or a cooling vessel coupled by pipes to the same, for a similar purpose.
Dated this 12th day of March 1890...
LAZARUS PYKE.
HARRY THEODORE BARNETT.
COMPLETE SPECIFICATION.
Improvements in Insulation and Cooling of Electrical Inductoria.
LAZARUS PYKE and HARRY THEODORE BARNETT, both of 34, New Tothill
Street, Westminster, Electrical 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 :-
These improvements relate to coils for sparking and other purposes & high tension
& other electric power converters.
We construct the apparatus with all or as much as possible of the mechanical
insulation of a permeable character, such as paper, & after being thoroughly dried
we place same in a container. & complete the insulation by pouring in a liquid
insulator such as paraffin (which, we prefer) which may have first been dried by
passing through a filter of powdered potassium or by some other convenient
method.
*We may provide a space in the container for this material, that the insulator
may be maintained permanently free from moisture.
-
The transformer is so arranged, that the liquid insulator may have as much
facility for circulating round & through same, as is necessary to keep down the
temperature, & again, to cool the liquid insulator in its turn, we so arrange the
container that it may offer sufficient surface for this purpose, & to this end we may
corrugate or otherwise extend the surface of the same & may add lugs or
projections or a cooling vessel coupled by pipes to the same for a similar purpose.
It is obvious that the external substance into which the heat is finally dissipated
may be air, water &c., & that the cooling vessel may be internal or external to the
apparatus container, also, where we have mentioned specific substances by way

page_text: of example it should be understood, that we do not confine ourselves to those
mentioned.
The accompanying drawings represent by way of example an induction apparatus
suspended in a glass vessel and connected with a cooling vessel of corrugated sheet
metal, Fig. 1 being partly a vertical section and partly an elevation, while Fig. 2 is
partly a horizontal section and partly a plan.
The
A represents the thick primary wire (only two layers) connected with the
terminals a, a; B represents the thin secondary wire which is arranged in three
superposed sections separated from each other by layers of porous paper c, c.
various concentric layers of each section are also separated from each other by
sheets of porous paper (indicated by black lines). D is the base plate of wood to
which the coils, together with core and cover E, are secured in the centre by a bolt.
F is a glass vessel, to which the base plate D forms a hermetically closing lid,
and which is provided with a pair of indiarubber or vulcanite plugs for conducting
the ends b, b.of the secondary wire B to their respective terminals.
-The opposite side of the vessel F has a pair of taps ƒ for controlling the inlet
and outlet of the insulating liquid which fills the space between the outer coil and
the glass. His a metallic cooling vessel resting on a shelf G at a higher level than
the glass vessel F, and provided at the top with a fill opening which is closed by a
screw cap h. i, are a pair of flexible pipes which connect the vessel F with the
cooler H both at the top and at the bottom, in order to establish a continuous
circulation of the insulating liquid.
Having now particularly described & ascertained the nature of our said inven-
tion & in what manner the same is to be performed, we declare that what we
claim is :-
1. In an electric coll or inductional apparatus, the internal insulation of the same
by means of a permeable material & fluid insulator.
II. In the fluid insulator for an electric coil or inductional apparatus-the drying
the same by means of a substance capable of absorbing or decomposing moisture.
III. In an electric coil or inductional apparatus insulated by a fluid-the
maintaining the whole free from moisture by a quantity of some substance
capable of absorbing or decomposing moisture, situated in some part of the
circulating system.
IV. In an electric coil or inductional apparatus insulated by a fluid-the con-
structing the same in an open manner to allow the ready circulation of the fluid
for the purpose of cooling the same.
V. In an electric coil or inductional apparatus cooled by means of a circulating
fluid insulator-the extension of the container surface by means of corrugations,
projections or a coupled vessel for the purpose of cooling the circulating insulator.
Dated this 30th day of October 1890.
1. In an electric coil or inductional apparatus, the internal insulation of the same
by means of a permeable material & fluid insulator.
II. In the fluid insulator for an electric coil or inductional apparatus-the drying
the same by means of a substance capable of absorbing or decomposing moisture.
III. In an electric coil or inductional apparatus insulated by a fluid-the
maintaining the whole free from moisture by a quantity of some substance
capable of absorbing or decomposing moisture, situated in some part of the
circulating system.
IV. In an electric coil or inductional apparatus insulated by a fluid-the con-
structing the same in an open manner to allow the ready circulation of the fluid
for the purpose of cooling the same.
V. In an electric coil or inductional apparatus cooled by means of a circulating
fluid insulator-the extension of the container surface by means of corrugations,
projections or a coupled vessel for the purpose of cooling the circulating insulator.
Dated this 30th day of October 1890.
LAZARUS FIRE.
HARRY THEODORE BARNETT.