Year: 1885

page_text: I, WILLIAM HENRY LINDSAY of 14 South Wharf, Paddington Basin in the .
County of Middlesex Engineer do hereby declare the nature of this invention to
be as follows:-
The object of my invention is more especially to form a corrugated plate of
iron or steel applicable especially for forming the decking or floor of a bridge also
for flooring of warehouses piers or long spans of roofing and of greater strength
for the weight of metal used than corrugated plates heretofore made for this
purpose.
According to my invention I form the upper part of each ridge and the lower
part of each furrow or hollow of the corrugated plate of thicker metal than the
sides of the corrugations so as to obtain greater strength with the same weight
of material as in the corrugated built up floor described by me in the specification
of a Patent N° 2607 in the year 1882.
A flat plate may for this purpose be first rolled with thick and thin portions
alternating and parallel with one another-and with the edges of thicker portions
gradually diminishing in thickness until they merge into the thinner portions.
Sheets so rolled.with alternating thicknesses of metal may afterwards be bent
into the corrugated-form required in a suitable press the corrugations being formed
in succession one after the other.-Or in place of this the corrugated sheet might
be formed of the varying thicknesses by passing a flat sheet of iron or steel through
rolls which not only corrugate it but also at the same time reduce it to the varying
thicknesses required;

page_text: •
I WILLIAM HENRY LINDSAY of 14 South Wharf, Paddington Basin in the
County of Middlesex 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 :-
The object of my invention is more especially to form a corrugated plate of 5
iron or steel applicable especially for forming the decking or floor of a bridge also
for flooring of warehouses piers or long spans of roofing and of greater strength
for the weight of metal used than corrugated plates heretofore made for this
purpose.
According to my invention I form the upper part of each ridge and the lower 1
part of each furrow or hollow of the corrugated plate of thicker metal than the
sides of the corrugations so as to obtain greater strength with the same weight of
material as in the corrugated built up floor described by me in the Specification
of a Patent No 2607 in the year 1882.
A flat plate may for this purpose be first rolled with thick and thin portions 1
alternating and parallel with one another-and with the edges of thicker portions
gradually diminishing in thickness until they merge into the thinner portions as
shewn at Figure 1 of the drawings hereunto annexed.
Sheets, so rolled with alternating thicknesses of metal may afterwards be bent
into the corrugated form shewn at Figure 2 in a suitable press the corrugations ?
being formed in succession one after the other. The press employed for this pur-
pose may be similar to the press at present used for forming corrugated plates from
flat plates of metal of uniform thickness. Or in place of this the corrugated sheet
might be formed of the varying thicknesses by passing a flat sheet of iron or steel
through rolls which not only corrugate it but also at the same time reduce it to the
varying thicknesses required.
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
The manufacture of corrugated plates of metal with two or more parallel corruga-
tions formed in them and with the upper part of each ridge and the lower part of
each furrow or hollow of the corrugated plate of thicker metal than the sides of the
corrugations substantially as described.