Year: 1888

page_text: I, WILLIAM LINDSAY, Eversley, 78 Mount Park, Ealing, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
In the specification of a Patent granted to William Henry Lindsay, date the 2nd
day of June 1882 No. 2607 a bridge floor constructed of metal troughs of a peculiar
section is described. These troughs were arranged with their concavities facing in
alternate directions and their sides were bolted together so as to form the floor. These
troughs have also been used for other structures.
The object of my invention is to obtain greater strength-I add metal at the ends
of the bottom of the trough so that the sides of the trough in place of being each
in a single plane as in the above mentioned specification are in two planes meeting
each other at an angle which is either obtuse or acute the latter form being given
by producing the ends of the bottom beyond their junctions with the sides-I also
slightly hollow the outer surface of the bottom of the trough so as to give a better
bearing for any structure which may be placed upon it.
When the section of metal described in the above mentioned specification is
employed in the construction of columns the greater portion of the metal is near
the axis of the column, which is thus made unnecessarily weak.
According to this invention I indent the bottom of the trough when it is to be
employed in the construction of columns so that the section assumes the form of
a double trough in place of being a plane surface as was described in the former
specification. I also in the process of rolling these sections make indentations or
projections to mark where the centre lines of the rows of rivets are to come.
Dated this 0th dove of Lulu 1000
CARPMAEL & Co.,
Agents.

page_text: Improvements in Bridges and other Structures.
I, WILLIAM LINDSAY of Eversley 73, Mount Park Ealing 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 :-
In the Specification of. a. Patent granted to Thomas Russell Crampton dated
26th October 1865 No. '2756 for the improvement of Roadways and also in a Patent
granted to William Henry Lindsay dated 2nd June 1882 No. 2607 for Bridge floor-
ings, Metal Troughs of peculiar sections were described-these troughs were rivetted
together to form a floor &c. &c. with their concavities facing in alternate directions.
These troughs have also been used for other structures.
The object of iny Invention is to obtain greater strength, I add metal at the ends
of the bottom of the trough so that the sides of the trough in place of being each in
a single plane as in the above mentioned Specifications are in two planes meeting
each other at an angle which is either obtuse or acute the latter form being given
by producing the ends of the bottom beyond their junctions with the sides-I also
slightly hollow the outer surface of the bottom of the trough so as to give a better
bearing for any structure which may be placed upon it.
When the section of metal described in the above mentioned Specifications is
employed in the construction of columns the greater portion of the metal is near the
axis of the column which is thus made unnecessarily weak.
According to this Invention I indent the bottom of the trough when it is to be
employed in the construction of columns so that the section assumes the form of a
double trough in place of being a plane surface as was described in the former
Specifications great difficulty having been found and expense incurred in fixing the
former construction owing to the trouble in determining the exact Centering for the
line of central rivetts which difficulty was increased by the bars never being
absolutely straight. 1 to obviate these difficulties in the process of rolling these
sections make indentations or projections in the form of a small line marking the
exact position of the centers of the line of rivetts-avoiding all chance of error and
saving the expense of marking.
In order that my said Invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figures 1. 2 and 3 are transverse sections I have adopted and Figure 4 shows a
column built up of troughs of the latter section...
In Figures I and 2 metal is added at the ends of the bottom of the trough at A. A.
and B B respectively so that in Figure 1 each side of the trough lies in two planes
inclined to each other at an obtuse angle whilst in Figure 2 each side lies in two
planes inclined to each other at an acute angle.--In both cases the outer surface of the
bottom of the trough is slightly hollowed out.

page_text: The section shown at Figures 3 and 4 is a double trough section.
The lines C. C. figures 1 and 2 mark the centre line of the rivets these are produced
during the process of rolling.
Although these troughs are shown all rolled in one piece it will be understood that
they may be built up of two or more pieces.
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 :-
1. Troughs for Bridges and other structures of which the sides of the trough lie
in two planes inclined to each other at an angle substantially as described.
2. Troughs for Bridges and other structures of a section substantially as described
and shown at Figure 1.
3. Troughs for Bridges and other structures of a section substantially as described
and shown at Figure 2.
4. Troughs for columns substantially as described and shown at Figures 3 and 4.
5. In troughs such as are above described making during the process of rolling
indentations or projections where the centre lines of the rows of rivets are to come.
Dated this 18th day of March 1889.
WILLIAM LINDSAY.