Year: 1888

page_text: Date of Application, 11th July, 1888
Complete Specification Left, 11th Mar., 1889
Complete Specification Accepted, 13th Apr., 1889
I CHARLES SCOTT SNELL of Culver Park Saltash Cornwall Engineer and Designer
do hereby declare the nature of this invention to be as follows:-
This invention has for its object the production of a casing or covering or bedding
for electrical conductors which shall be light and easily fitted up and offer considerable
resistance to fire or damp or both thus decreasing the danger from leakage or over-
heating from Electrical mains or appurtenances. For this purpose I form the casing
of paper or its equivalent composition such as millboard strawboard pasteboard or
papier-maché and mould set roll or otherwise form it into convenient shape for one
or more Electrical conductors. This paper or its equivalent I treat either in the pulp
stage or after its final shape has been given with water proofing or fireproofing solutions
or both or I may intermix with or form the pulp partially from Asbestos with alumn
and borax this paper being very incombustible. The waterproofing solution may
consist of a solution of oxide of copper in ammonia which partially dissolves the
cellulose of the paper and converts it into an impermeable varnish or simple coating
with soap and then with sulphate of copper or alum or any other well known com-
position or medium may be used.
To increase the incombustibility the pulp may be mixed with an aqueous solution
of tallow soap and alum this requiring no size or a solution of silicate of soda may be
painted over the finished material or alum and sulphate of copper or a vitreous
solution from soda siliceous earth and charcoal or ordinary asbestos paint and many
other well known compositions may be used. In some cases where overheating is
otherwise provided against I use a backing of paper waterproofed and a covering of
wood suitably grooved for the conductors, facing the backing. I find this paper
makes very effective saddles for attaching the conductor to walls where casing throughout
is unnecessary and when formed under heavy pressure it is very light strong and
otherwise effective.

page_text: I, CHARLES SCOTT SNELL of Culver Park Saltash Cornwall Engineer and Designer
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 its object the production of a casing or covering or bedding
for Electrical conductors which shall be light and easily fitted up and offer considerable
resistance to fire or damp or both thus decreasing the danger from leakage or over-
heating from Electrical mains or appurtenances. For this purpose I form the casing
of paper or its equivalent composition such as millboard strawboard pasteboard or
papier machie and mould set roll or otherwise form it into convenient shape for one
or more Electrical conductors. This paper or its equivalent I treat either in the pulp
stage or after its final shape has been given with waterproofing or fireproofing
materials or solution or both or I may intermix with or form the pulp partially from
Asbestos with alum and borax, this paper being very incombustible. The water-
proofing solution may consist of a solution of oxide of copper in ammonia which
partially dissolves the cellulose in the paper and converts it into an impermeable
varnish or simple coating with soap and then with sulphate of copper or alum or any
other well-known composition may be used.
To increase the incombustibility, the pulp may be mixed with an aqueous solution
of tallow soap and alum this requiring no "size" or a solution of silicate of soda may
be painted over the finished material or alum and sulphate of copper or a vitreous
solution from soda siliceous earth and charcoal or ordinary asbestos paint or many
other well known compositions may be used. In some cases where overheating is
otherwise provided against I use a backing of paper waterproofed and a covering of
wood suitably grooved for the conductors facing the backing. I find this paper
makes very effective "saddles" for attaching the conductor to walls where casing
throughout is unnecessary and when formed under heavy pressure it is very light and
otherwise effective.
Reference to the annexed drawings will clearly show the application of material
formed as above described, the letter A throughout indicating the Electrical
conductors, B indicating woodwork and C the material described above. In
Figs. 1-2-3-5-8 (cover of, if formed as shown at E) 9 13 and 14 (the two
last being saddles") the material is supposed semi-flexible but in Figs. 4, 11, 8
(cover of, if formed as shown dotted at F) and 6 it is supposed very rigid (compressed
or otherwise treated).
16
"
"
In Figs. 5-6 (cover of) 7-10-12 it is immaterial whether specially hard or soft.
At Figs. 4 11 and 8 (at F) is shown arrangements for sliding covers on or off or
springing them over the base part Fig. 15 shows how the flange may be moulded
so that screws or nails are put in at regular intervals and without interfering with
the design.

page_text: In Fig. 7 the wires or cables are threaded through the material and in 14
the cable is passed through separate tubes. Although only two wires are shown
in many Figures it is evident that a slight modification would admit of three
or more.
In Fig. 10 the dotted lines show how the sides of the base piece may be formed
where great dampness exists. In Fig. 5 ribs are formed transversely to strengthen
the material they may also be formed longitudinally and of course any design or
pattern imprinted.
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,
1st. The production of casing for holding Electrical "leads" formed from paper
or equivalent pulp in conjunction with solutions or materials rendering it wholly
or partially fire or water proof or both substantially as described.
2nd. The production of casing for holding Electrical "leads" formed from paper
or its equivalent having the surfaces treated with solutions or materials rendering it
wholly or partially fire or water proof or both substantially as described.
3rd. The use of casing formed partially of wood and partially of specially treated
paper or its equivalent substantially as described and illustrated in Figs. 1-8
and 10.
4th. The use of casing formed so as to admit of bending lapping and jointing
substantially as illustrated and described in Figs. 1, 2, 3, 5 and 9.
5th. The use of short sections of casing in "saddles" formed of specially treated
paper or equivalent substantially as described and illustrated in Figs. 13 and 14.
Dated this 11th day of March 1889.
C. SCOTT SNELL.