The republic. [volume] (Washington [D.C.]) 1849-1853, 1850-11-23
TO THE PUBLIC.
NEW RAILROAD BRIDGES.

INHE subscribers, having had many years expe-
Il rience in planning and building public and
private buildings and bridges, are prepared 70
furnish plans and specifications of their NEW
WOODEN BRIDGE for railroad and other compa-
MES, according 10 the plan described in the :
nexed article from the Washington Republic. }
They will also attend personally to the erection of
bridges in any part of the United States and will
warrant their work TO stand given number Of
years. X. * o. S. WARREN,
Architects and Bridge Builders,
Noy20-3t Providence, Rhode Island.
IMPORTANT IMPROVEMENT IN BRIDG Es.-W have
mad an opportunity OF examining models OF the new
bridge for railroads and other purposes, invented
by Meesrs. r. & o. S. Warren, Architects and
Engineers, of Providence, Rhode Island recently
secured at the Patent Office by caveat. We CON
sder this as worthy the notice of all persons inter
| ested in having safe, durable, and economical
bridges constructed. One of it's notifications
ssts of four trusses composed of horizontal parallel
chords, connected by angular and arched braces,
clamps, and keys. The braces arranged as
TO form series OF pyramids, longitudnaly well
as transversely, the trusses being placed in pairs,
each pair forming section Of pyramid trans
versely. BY this arrangement the structure is
dered very firm and secure from oscating, later
ally or longitudinally, on the entrance of heavy
trains OF cars; and also prevented from sinking and
rebounding at the middle Of its length when the
train enters upon and suddenly leaves the bridge,
which ID generally the of the failure of iron
bridges, particularly in frosty weather. The
Mcssrs Warren, who, we learn have constructed
many bridges of various kinds in the United States
have found by experience that in building bridges
of wood, as much iron work should be dispensed
with as possible; bridges built mostly of wood,
and loaded down with long iron rods, and cast
iron splicing plates and shoes, in numerous
bridges heretofore constructed. have often failed
| particularly at the North, during cold and frosty
weather. The mode Of construction adopted by
these gentlemen will enable the architect to bridge
rivers of three hundred feet width by single span
by simply increasing the height of the trusses less
than thirty feet being sufficient for span Of three
hundred feet. Light abutments and piers will
swer, there is longitudinal lateral thrust,
the pressure being entirely vertical This bridge
not only possesses great simplicity, strength, dura
blity, and economy but also facilities for making
repairs whenever necessary. The floor for the iron
rails of the track may rest upon the upper lower
range of chords or strings. The bridge may also
be closed its four sides and rooted or left open
This principle of truss is also well adapted for roofs
of great span, where small pieces OF timber are
abundant, and large timbers scarce, rendering
1t unnecessary to resort to heavy grders and the
usual kind of expensive framing. This adaptation
is effected by simple modification of the truss
The bridge possesses other advantages, which will
be evident to the architect and engineer, upon an
examination of the models and drawings, to be
seen at the Office of Mr.. w p. Elliot architect and
engineer, opposite the Patent Office, Washington
city