Improvements in Underground Conduits for Conductors of Electricity.
Year: 1891

page_text: Date of Application, 23rd Feb., 1891
Complete Specification Lett 23rd Nov. 1891-Accepted. 24th Dec.. 1891
.
PROVISIONAL SPECIFICATION.
Improvements in Underground Conduits for Conductors of
Electricity.
We, JOHN SMITH RAWORTH of 112 Belvedere Road, Lambeth in the County
of Surrey, Engineer, THOMAS OCTAVIUS CALLENDER of 101 Leadenhall Street,
London, Engineer, and CHARLES EDMUND WEBBER of 17 Egerton Gardens
Brompton, in the County of Middlesex, Major General, Royal Engineers, retired,
do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in the construction of underground
conduits for conductors of electricity.
For this purpose we propose to use paper tubes embedded in bitumen, either
pure or in combination with some other suitable material as for examples sand
or sawdust, the whole being contained in and protected by an iron case or channel.
In proceeding to lay the improved conduits we first fix the iron channel in a
trench cut in the ground, the separate sections being roughly jointed together; we
then introduce the paper tubes, carefully jointing the same and arranging them at
about equal distances apart by spacing strips of suitable material, as for examples
wood, bitumen, or carthenware. The interstices between the tubes and between
the tubes and the iron channel are filled in with melted bitumen and an iron cover
is then placed over all.
The use of the bitumen as described makes the conduits perfectly watertight and
gives a high degree of insulation.
By the use of conduits constructed as described, the highest degree of safety and
and durability is attained, and when the conductors are not required to carry a
high tension current they may be used without any insulating covering other than
the conduit.
Dated this 02nd day of Wahun-1901
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Underground Conduits for Conductors of
Electricity.
We,
JOHN SMITH RAWORTH, of 112 Belvedere Road, Lambeth in the County
of Surrey, Engineer, THOMAS ÓCTAVIUS CALLENDER of 101 Leadenhall Street,
London, Engineer, and CHARLES EDMUND WEBBER of 17 Egerton Gardens
Brompton, in the County of Middlesex, Major General, Royal Engineers, retired,
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 reference to improvements in the construction of underground
conduits for conductors of electricity.
For this purpose paper tubes to contain the conductors of electricity, are
embedded in bitumen, either pure or in combination with some other suitable
material as for examples sand or sawdust, the whole being contained in and protected
by an iron case or channel.
In proceeding to lay the improved conduits we first fix the iron channel in a
trench cut in the ground, the separate sections being roughly jointed together; we

page_text: then introduce the paper tubes; carefully jointing the same and arranging them
at about equal distances apart by spacing strips of suitable material, as for
examples wood, bitumen, or earthenware. The interstices between the tubes and
between the tubes and the iron channel are filled in with melted bitumen and an
iron cover is then placed over all.
The use of the bitumen as described makes the 'conduits perfectly watertight
and gives a high-degree of insulation:
By the use of conduits constructed as described, the highest degree of safety and
durability is attained, and when the conductors are not required to carry a high
tension current they may be used without any insulating covering.other than the
conduit.
In the accompanying, drawings
Fig. 1 is a transverse section and
Fig. 2 a longitudinal section of our improved conduit.
a, a, a, a, are the paper tubes to contain conductors of electricity they are
shewn with spigot joints and are carried on bitumenized wood or other suitable
insulating supports within the metal case e having a removable lid' d.
The bitumen or bitumen compound filling all the interstices is shown at e e e e
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. An underground conduit for conductors of electricity, comprising paper
tubes, a metal case or channel with removable cover and in which the paper
tubes are arranged longitudinally, supports' such asb b of insulating material,
and a filling of bitumen or bitumen compound as and for the purposes described.
Dated this 23rd day of November 1891.
W LLOYD WISE,
Per F. J. Brougham.