A Novel Arrangement of Incombustible Roof.
Year: 1888

page_text: Date of Application, 1st Dec., 1888
Complete Specification Left. 31st Aug., 1889-Accepted, 12th Oct.. 1889
PROVISIONAL SPECIFICATION.
A Novel Arrangement of Incombustible Roof.
JOHN DINSMORE of Old Green Ballymena County Antrim Ireland Woollen
Manufacturer do hereby declare the nature of this invention to be as follows :-
The object of this invention is to provide a simple and light arrangement of
wrot iron framing to carry slates tiles sheet metal or glass so as to form an incom-
bustible roof and entirely dispense with wood in the construction.
The peculiar means I adopt to attain this object consist in forming the two rafters
out of one piece of inverted T iron which is bent to the required angle to form the
ridge. The lower ends of the rafters resting on iron gutters upon the walls or
columns.
The flange and web of the inverted T iron form the rebate for receiving the covering
material of slates tiles sheet metal or glass which is held in position with the required
amount of overlap at each joint by mastic cement or other suitable material for
bedding.
The apex or junction of the glass or slates being covered by an angular piece of
metal or ridge tile.
The peculiar feature of this method of constructing roofs being the making of the
two rafters out of one piece so that no ties are required at the feet of the rafters to
prevent them from spreading and fixing the covering material between the rafters so
that a perfectly open space is left in the roof without any-ledges for the accumulation
of dust or other inflamable matter in rooms where risky operations are performed.
Dated this 90th day of November 1888.
DINSMORE
TAG DINSMORE
COMPLETE SPECIFICATION.
A Novel Arrangement of Incombustible Roof.
JOHN DINSMORE of Old Green Ballymena County Antrim Ireland Woollen
Manufacturer 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 :-
The object of this invention is to provide a simple and light arrangement of wrought
iron framing to carry slates tiles sheet metal or glass so as to form an incombustible
roof and dispense entirely with the use of wood.
arrangement.
1
The peculiar means I adopt to attain this object will be understood from the
following description along with reference to the drawing in which
Figs. 1 and 2 are sections of roofs constructed according to this
Fig. 3 is a section on a larger scale of the gutter employed.
Fig. 4 is a section on a larger scale of the rafters with the covering material
between them.
Fig. 5 is a section also on a larger scale of the ridge cover.
The two rafters (a) are formed out of one piece of inverted T iron which is bent
to the required angle to form the ridge.
The lower ends of the rafters (a) rest upon and are fastened to the cast iron
gutters (6) which are carried by the walls (d) or columns (c) and the rafters (a) are
stayed by wrot iron purlins (k) placed at a convenient distance apart.
The flange and web of the inverted T iron (a) forming the rebate for receiving
the covering material of slates (e) tiles (f) sheet metal or glass (g) which is held in
position with the required amount of overlap at each piece by mastic cement (h) or
other suitable material for bedding.

page_text: The apex or junction of the glass (9) or slates (e) being covered by an angular
piece of metal or ridge tile (f).
The peculiar feature of this method of constructing roofs being the making of the
two rafters (a) out of one piece so that no ties are required at the feet of the rafters (a)
to prevent them from spread ng and fixing the covering material (e. f. g) between
the rafters (a) so that a perfectly open space is left in the roof without any ledges
for the accumulation of dust or other inflamable matter in rooms where risky
operations are performed; by this arrangement of slating about one third the quantity
of slates will cover the same area as by the ordinary method of overlapping.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
The arrangement of incombustible roof described and illustrated with the two
rafters made of one piece of inverted T iron and with the covering material carried
between the rafters.
Dated this 90th
Ը A
1000
JOHN DINSMORE.