Year: 1888

page_text: Date of Application, 15th Feb., 1888
Complete Specification Left, 15th Nov., 1888
Complete Specification Accepted. 12th Feb., 1889
I, SEBASTIAN ZIANI DE FERRANTI of 120 Fellows Road, Hampstead in the County
of Middlesex, Electrician do hereby declare the nature of this invention to be as
follows:-
The central portions of conductors used for conveying alternating currents of high
tension are as is known of little service in conveying the current.
To remedy this I form each conductor as a flexible cable composed of a number of thinly
insulated wires of comparatively small diameter with insulating material surrounding
the whole assemblage of wires or I make each conductor of two or more concentric
tubes drawn one over the other with thin insulating material between them and where
each electrical main is formed with a return tubular conductor as described in the
specification of a Patent granted to me No. 15251 in the year 1885, I in addition to
forming each conductor of a metallic tube drawn one over the other with thick
insulating material between the two now form each tubular conductor of two or more
tubes similarly drawn one over the other but with comparatively thin insulation.
between them.
At the junctions between the several lengths of which a main is formed-I make the
joint between the adjoining ends of the inner compound tubular conductors in the way
described in the above mentioned specification by cutting them off on the bevil and
making their ends abut against conical ends of a short metallic tube inserted between
them the joints for the outer conductor I also make in a similar manner by
causing bevilled ends of the conductors to be brought against bevil surfaces on
the inner side of a ring so that when the adjoining ends of two sections are drawn
and held one towards the other the connections between the conductors is completed
and an extended surface given where the ends of the conductors meet the tubular
connecting pieces so that the passage of the current is unimpeded.
The inner tubular connecting piece may be split longitudinally so that when the ends
of the outer conductors are to some extent pressed inwards by the inclines of the outer
connecting ring it may yield and allow all surfaces to be brought into close contact.

page_text: In some cases where a high pressure electrical main is used together with converters
for supplying low pressure current to a second main I carry. the high pressure main
through the interior of the low pressure one and use the outer conductor as a return
conductor for both.
I SEBASTIAN ZIANI DE FERRANTI of 120 Fellowes Road Hampstead, in the County
of. Middlesex, 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
n and by the following statement :-
The central portions of conductors used for conveying alternating currents of high
tension are as is known of little service in conveying the current.
To remedy this I (as shown at Figures 1 and 2) form each conductor as a flexible
cable composed of a number of thinly insulated wires of comparatively small diameter
with insulating material surrounding the whole assemblage of wires. I form the
the lightly insulated wires into a number of separate small ropes, and lay these small
ropes around a central core of hemp or other material to form as shown at Figure 1 a
rope of larger diameter. In this way the average distance of all the wires from the
centre of the rope will be the same and an equal amount of current will pass through
each wire. The exterior of the conducting rope may be thickly insulated.
Or in place of the above construction I make each conductor of two or more
concentric tubes drawn one over the other with thin insulating material between thei
and where each electrical main is formed of two concentric conductors drawn one over
the other with thick insulating material between (as described in the Specification
of a Patent granted to me No. 15251 in the year 1885) I now in addition form
each of the two conductors of two or more tubes similarly drawn one over the other,
but with comparativly thin insulation between them.
At the junctions between the several lengths of which a main is formed I make the
joint between the adjoining ends of the inner compound tubular conductors in the way
described in the above mentioned Specification by cutting them off on the bevil and
making their ends abut against conical ends of a short piece of main, inserted
between them the joints for the outer conductor I also make in a similar manner by
causing bevilled ends of the conductors to be brought against bevil sufaces on the

page_text: inner side of a piece of main so that when the adjoining ends of two sections are
drawn and held one towards the other the connection between the conductors is
completed and an extended surface given where the ends of the conductors meet
the tubular connecting pieces so that the passage of the current is unimpeded.
The inner tubular connection may be split longitudinally so that when the ends
of the outer conductors are to some extent pressed inwards by the inclines of the
outer connecting ring it may yield and allow all surfaces to be brought into close
contact. A longitudinal section of a conductor and joint formed in this manner is
shewn at Figure 3 and a cross section taken through the joint is shewn at Figure 4.
In these figures A is the inner conductor made up of a series of tubes drawn down one
over the other. B the similarly formed outer conductor. (the insulation between
the two. D the inner tubular connecting piece and E the outer connecting ring.
In some cases where a high pressure electrical main is used together with converters
for supplying low pressure current to a second main, I carry the high pressure
main through the interior of the low pressure one and use the outer conductor as
a return conductor for both.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is
1. An electrical main composed of a number of thinly insulated wires formed into
a cable or rope substantially as described for conveying alternating currents of high.
tension.
2. An electrical main composed of thinly insulated wires so put together that each
wire has the same average distance from the centre of the main.
3. An electrical main composed of a number of concentric tubes drawn one
over the other with thin insulation between them.
4. An electrical main composed of two tabular conductors drawn one over the other
with thick insulation between and with each conductor formed of tubes similarly
drawn one over the other with thin insulation between.
5. Forming the joints between adjoining ends of lengths of such conductors
substantially in the manner herein described whether each of the conductors is formed
of a single tube or two or more concentric tubes.
Dated this 15th day of November 1888.