A New and Improved Protector for Electric Cables Laid Underground.
Year: 1894

page_text: Date of Application, 8th Feb., 1894
PROVISIONAL SPECIFICATION.
A New and Improved Protector for Electric Cables Laid
Underground.
THOMAS BARNET GRANT 15 George Street, Mansion House, London,
Engineer do hereby declare the nature of this invention to be as follows:-
Cables which are laid bare in the earth whether armoured or unarmoured are
liable to a certain amount of damage from workmen who may have to open the
ground after the cables are laid. To obviate the possibility of this and to more
learly indicate to workmen the position of the cable I cover the cable for the
whole of its length with protectors made as follows. I mould in suitable lengths
protectors of proper thickness with a cross sectional shape of a semicircle with
Hanged extremities or three sides of a square with flanged extremities. I prefer to
use bitumen or a compound of tar & asphalte & before the compound is poured into
the moulds I place in position in the moulds strips or scraps of iron or iron wire or
woven wire mesh or iron plate or scraps of other metals. These strips or
scraps or plates are placed in such a way that the compound completely surrounds
them and binds them together & they are arranged so that their position in the
substance of the protector gives it great mechanical strength & rigidity & the
power to resist fracture from a blow of a pick or spade.
Dated this Seventh day of February 1894.
A New and improved Protector for ԿԵՆՍ
Underground.
P53
I, THOMAS BARNET GRANT, 15 George Street, Mansion House, London,
Engineer, 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
Cables which are laid bare in the earth, whether armoured or unarmoured, are
liable to a certain amount of damage from workmen who may have to open the
ground after the cables are laid. To obviate the possibility of this and to more
clearly indicate to workmen the position of the cable, I cover the cable for the
whole of its length with protectors made as follows: I mould in suitable lengths,
such as 6 feet, protectors of proper thickness with a cross sectional shape which
may be that of a semicircle with flanged extremities or three sides of a square with
flanged extremities.
I prefer to use bitumen or a compound such as bitumen 30 parts, pitch 65 parts
and tar 5 parts and before the compound is poured into the moulds I place in position
in the moulds strips or scraps of iron or iron wire or woven wire mesh or iron plate
or scraps of other metals. These strips or scraps or plates are placed in such
a way that the compound completely surrounds them and binds them together and
they are arranged so that their position in the substance of the protector gives it

page_text: great mechanical strength and rigidity and the power to resist fracture from a blow
of a pick or spade.
The accompanying drawings are sections of some forms of protectors according
to my invention.
Figs. 1, 2 and 3 are intended for being placed over conductors when laid in a
trench in the ground. The metal core A may be a bent plate as in Fig. 1 or a
number of strips, as in Fig. 2 or of pieces of various forms, strips wires, rods &c. as
in Fig. 3. When protectors such as those shewn in Figs. 4 and 5 are employed,
they are first inverted, the conductor is laid in them and the mouth B is covered
it may be with pieces of wood; the whole is then turned over in the trench. The
metal A may be an interior lining as shewn in Figs. 6 and 7.
Having now, particularly described and ascertained the nature of this, inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A protector for electric cables laid underground, substantially as described.
Dated this 5th day of December 1894.
ABEL & IMRAY,
Agents for the Applicant.