An Improvement in Electrical Insulators.
Year: 1887

page_text: Date of Application, 29th Aug., 1887
Complete Left, 29th May, 1888
Complete Accepted, 29th June, 1888
An Improvement in Electrical Insulators.
We WILLIAM EDWARD LANGDON of 5 Grove Terrace, Derby in the County of
Derby Superintendent of the Midland Railway Company's Telegraph Department,
Derby, and JOHN CRISP FULLER and GEORGE FULLER, both of Newcastle Wharf
Works, Old Ford Road, Bow, in the County of Middlesex, Electricians and Telegraph
Engineers do hereby declare the nature of this invention to be as follows:-
According to our invention we turn up the bottom or lower end of the inner tube
of the insulator so as to form a cup or receptacle at or near the base thereof in which
cup or receptacle we pour melted paraffin wax or other insulating material which
hardens in its place and can afterwards be wiped clean when required. By the use
of this cup or receptacle containing insulating material as aforesaid, a perfect insulation
between wire and bolt is obtained.
The invention is particularly applicable to that class of insulator for which a patont
has been granted to us the 19th September 1882 No. 4450, and to other forms of
insulators.
WILLIAM EDWD. LANGDON.
JOHN CRISP FULLER.
GEORGE FULLER.
By Brewer & Son,
Agents.

page_text: COMPLETE SPECIFICATION.
An Improvement in Electrical Insulators.
We, WILLIAM EDWARD LANGDON, late of 5 Grove Terrace, but now of The Lawn,
Belpar, Derby in the County of Derby, Superintendent of the Midland Railway
Company's Telegraph Department, Derby, and JOHN CRISP FULLER and GEORGE
FULLER, both of Newcastle Wharf Works, Old Ford Road, Bow, in the County of
Middlesex Electricians and Telegraph 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 object of our invention is to provide a more perfect insulation than heretofore
between the wire and the bolt of electrical insulators, such mode of insulation being
applicable to various forms of same; and particularly to that class of insulators for
which a patent was granted to us dated 19th September 1882 No. 4450.
In order that our present invention may be fully understood and readily carried
into effect we will describe the same with reference to the accompanying drawings.
Figure 1 is a vertical section of an insulator the insulation being applied thereto and
constructed according to our invention, and Figure 2 is a vertical section of an
insulator of similar form to that described in the Specification of our aforementioned
patent dated 19th September 1882 No. 4450, but where the insulation according to
this invention is shewn applied thereto both to the inner and outer tubes or cups
of same.
:
According to our invention we turn up the bottom or lower end of the inner tube
or cup A of the insulator, as at Figure 1 so as to form a cup or receptacle A at or
near the base thereof, or we form a groove B in the lower edge of the outer tubo:
or cup
B¹ or in some cases both the inner tube or cup A' and the outer tube or
cup B¹ may be formed with receptacles as is shewn at Figure 2.
In the cups or receptacles A B which we prefer making of annular form we pour
melted paraffin wax or other insulating material which hardens in its place and the
exposed surface of such insulating material can afterwards when required be wiped
clean from time to time..
By the use of these cups or receptacles containing a ring or rings of insulating
material as aforesaid, a more perfect insulation between the wire and bolt is obtained
than heretofore.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we
claim is :-
1
In pleatrical insulto il

page_text: to the cup or tube A¹ or B¹ and near the base of same, such groove being filled with
paraffin wax or other suitable insulating material for the purpose set forth and with
reference to the accompanying drawings.
2. In electrical insulators the grooves, cups or receptacles formed or applied at or
near the lower edges of the tubes or cups A' or B' such grooves being filled with
paraffin wax or other suitable insulating material as and for the purpose set forth
and with reference to Figure 2 of the accompanying drawings.