IMPROVEMENTS IN THE MEANS FOR PROTECTING ROOFS. WALLS. AND LIKE SURFACES
Year: 1882

page_text: LETTERS PATENT to Benjamin Lumsden Thomson, of Gracechurch Street,
in the City of London, for an Invention of "IMPROVEMENTS IN THE MEANS
FOR PROTECTING ROOFS. WALLS. AND LIKE SURFACES."
PROVISIONAL SPECIFICATION left by the said Benjamin Lumsden Thomson
at the Office of the Commissioners of Patents on the 27th January 1882.
BENJAMIN LUMSDEN THOMSON of Gracechurch Street in the City of London
"IMPROVEMENTS IN THE MEANS FOR PROTECTING ROOFS WALLS AND LIKE
SURFACES."
My said Invention relates to improvements in the means for protecting walls
roofs and like surfaces. According to my said Invention the roof or like surface
to be protected is covered with a plate or plates of iron, tin, copper yellow metal
zinc or other suitable metals or alloys. The plates are enamelled or covered or
coated with vitreous materials on both sides thereof that is to say both on the side
which is presented towards the roof or like surface to be protected and on the sido
presented away from the said roof or surface or are so covered or coated on one
side only the plates being preferably covered on the side to be attached to the roof
or like surface with suitable cement, glue or other adhesive substance or being
attached in addition to this cement or in substitution therefor by nails screws or
like fastenings. Where nails screws or like fastenings are employed to attach the
plates to the roof or like surface I make the holes for the said fastenings large
enough to allow of the shifting of the plates from contraction or expansion and
underneath the head or neck of the said fastenings I place a sufficient quantity of
rubber felt or the like as a washer covering this enlarged hole to render this
allowance for shifting in the plates practicable:
The plates are formed with a bevel or turn down edge to be embedded in or in
the cement or adhesive composition on the roof or like surface to bo protected to
prevent corrosion setting up canvas-cloth or paper or other fabric saturated with
prepared india rubber gutta percha tar asphalte ozokerite (or Jews pitch) one or

page_text: more of them or thin vitrified iron plates may intervene between the outside metal
plates and the roof or like surface be protected.
I further apply the aforesaid plates of suitable size as, or to cover, moveable
partitions, walls between rooms, slips or divisions on the stages of theatres places
of public amusement or public halls and for all other purposes of stage work 5
liable to fire. They may be on rollers running in grooves to be moveable as
required.―
The outer surfaces of the plates may be ornamented by painting thereon or
attaching thereto designs or other ornaments:-
I coat or cover the plates (especially where they are employed for roofing) on one 1
side or on both sides with my liquid known as Thomson's Decorative Enamel :-
In roofs or like surfaces protected by plates according to my Invention I cover
or fill in all joints or the like with cement glue or other adhesive and protective
materials of a like nature.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Benjamin Lumsden Thomson in the Great Seal Patent Office on the
26th July 1882.
BENJAMIN LUMSDEN THOMSON of Gracechurch Street in the City of London
"IMPROVEMENTS IN THE MEANS FOR PROTECTING ROOFS, WALLS, AND
SURFACES."
LIKE
My said Invention relates to improvements in the means for protecting walls
roofs and like surfaces.
According to my said Invention the roof or like surface to be protected is
covered with a plate or plates of iron or tin. The plates are enamelled covered or
coated with vitreous materials on both sides thereof that is to say both on the side
which is presented towards the roof or like surface to be protected and on the sido
presented away from the said roof or surface. Or they may be covered or coated
on only one side the plates being preferably covered on the side to be attached to
the roof or like surface with suitable cement glue or other adhesive substance. In
addition to this cement or equivalent means of addition (or in substitution therefor)
I may employ nails screws or like fastenings. Where nails screws or like fastenings
are employed to attach the plates to the roof or like surface I make the holes for
the said fastenings large enough to allow compensation of the plates from
contraction or expansion and underneath the head or neck of the fastenings I place
a sufficient quantity of rubber felt or the like as a washor to render such
compensation practicable.
The plates are formed with a bevel or turn down edge to prevent corrosion.
Cloth or paper or other fabric saturated with prepared india rubber gutta percha
tar asphalto ozokerite (or Jows pitch) either separately or combined or vitrified
iron plates may intervene between the outside metal plates and the roof or like
surface bo protected.
I further apply the aforesaid plates of suitable size to cover moveable partitions,
walls compartments of ships or divisions on the stages of theatres places of public
amusement and for all other similar purposes requiring protection from fire.
The plates may be arranged on rollers running in grooves so as to be moveable as
required.
The outer surfaces of the plates may be ornamented by painting thereon or
attaching thereto designs or other ornaments.
I coat or cover the plates (especially where they are employed for roofing) on
one side or on both sides with my liquid known as Thomson's Decorative Enamel.
For roofs or like surfaces protected by plates according to my Invention I cover
or fill in all joints or the like with cement gluo or other adhesive and protective
materials of a like nature.
Having now described and particularly ascertained the nature of my said Inven-
tion and the manner in which the same is or may be used or carried into effect I
would observe in conclusion that what I consider to be novel and original and
therefore claim as the Invention secured to me by the hereinbefore in part recited
Letters Patent is :-
The application or use of enamelled or vitrified iron plates for covering and
protecting roofs walls and other like surfaces substantially as hercinbefore
described.
In witness whereof I the said Benjamin Lumsden Thomson have to this
my Specification set my hand and seal this Twentieth day of July One
thousand eight hundred and eighty-two.