Improved Compound for Electric Insulating Purposes.
Year: 1890

page_text: Date of Application, 31st July, 1890
Complete Specification Left, 30th Apr., 1891-Accepted, 6th June, 1891
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PROVISIONAL SPECIFICATION.
Improved Compound for Electric Insulating Purposes.
We, WILLIAM SINCLAIR, of 78 Beverley Road, Hull, Yorkshire, Gentleman,
and BARBARA SARAH JANE MACKAY, of Lower Park Road, Belvedere, Kent,
Bottling Cement Manufacturer, do hereby declare the nature of this invention to
be as follows:-
This invention has for object, the compounding of certain ingredients in or about
certain proportions and the employment of such compound as an insulating medium
for electrical purposes in general.
According to this invention, we employ sulphur, pipe clay, slate dust, and an oxide
or oxides of metal, in say, the following proportions:--
7 lbs. sulphur,
1
lbs. clean pipe clay,
1
lbs. slate dust,
2
oz. paraffine wax,
and the necessary quantity of oxide of any metal, say, of copper, or of iron
to suit the desired colour.
The pipe clay and the slate dust are thoroughly mixed by a grinding under heat,
the paraffine wax being then admixed and the combination worked up to a paste.
It is then, after exposure to become dry and hard, ground into a powder and the
sulphur mixed therewith, also the oxide or oxides, the nature and quantity of which.
is somewhat determined by the colour desired.
The oxide has a slight cohesive action and assists to bind the particles of the
other ingredients and also for commercial purpose adds to the weight.
The compound thus prepared can by heat be rendered plastic for moulding
purposes.
Dated this 31st day of T... 1900
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said W. Sinclair and B. S. J. Mackay.
COMPLETE SPECIFICATION.
Improved Compound for Electric Insulating Purposes.
We, WILLIAM SINCLAIR, of 78 Beverley Road, Hull, Yorkshire, Gentleman,
and BARBARA SARAH JANE MACKAY, of Lower Park Road, Belvedere, Kent,
Enamel and Varnish Manufacturer 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 has for object, the compounding of certain ingredients in or about
certain proportions, and the employment of such compound as an insulating medium
for electrical purposes in general.
According to this invention, we employ sulphur, pipe clay, slate dust, and an oxide
or oxides of metal, in say, the following proportions.
7 lbs. sulphur,
1
lbs. clean pipe clay,
1 lbs. slate dust,
oz. paraffine wax,
and the necessary quantity of oxide varying from one fourth to one half of the

page_text: above total weight, of any metal, say of copper, or of iron to suit the desired
colour.
The pipe clay and the slate dust are thoroughly mixed by a grinding under heat,
the paraffine wax being then admixed and the combination worked up to a paste.
It is then, after exposure to become dry and hard, ground into a powder and the
sulphur mixed therewith, also the oxide or oxides, the nature and quantity of which
is somewhat determined by the colour desired..
The oxide has a slight cohesive action and assists to bind the particles of the
other ingredients and also for commercial purpose adds to the weight.
The compound thus prepared can, by heat, be rendered plastic for moulding
purposes.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we
claim is :-
Compounding the ingredients hereinbefore mentioned in the manner described for
electric insulation purposes, as set forth.
The 30th day of April 1891.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said William Sinclair and Barbara Sarah Jane Mackay.