It is clear they didn’t size their members or give details as to the load, either tension or compression in their diagonals. The angles of the plates are regulated by longitudinal screw rods and nuts. They are bolted at top to horizontal compression rods, and at bottom to horizontal tension rods, and carry a roadway at top or at bottom, or at both.Ģ) Or the bridge may be built of cast iron side angular frames (placed with the apices downwards), which have their bases bolted together, end to end, and their apices bolted to horizontal rods.ģ) Or, instead of the preceding modes of longitudinal construction, hollow cast-iron transverse frames may be employed, which are inclined, and bolted together at top, and are similarly attached at bottom to horizontal rods, bars, or plates.Ĥ) Or wrought iron tie rods may be bolted at top to compression rods, and at bottom held together by the side of wooden girders, and the structure strengthened by means of stay rods.
Wooden lattice angels figures series#
The specification of this invention exhibits four different modes of building bridges, which it is stated may, with some slight modifications, be applied to the construction of aqueducts and roofing.ġ) The bridge is built with cast iron side bands, rods, or plates, inclined towards each other, and combined so as to form a series of Vandykes. Warren and Monzani patent drawing showing deck at both levels. Blood developed a method of analyzing triangular trusses, as Whipple had.įigure 3.
Even though Squire Whipple in the United States had published the method of determining loads in truss members under uniform and varying loads, this method had not made its way to England. The title of the patent application was Construction of Bridges and Aqueducts and was issued on Augwith Patent #12,242. The top chord cast iron members were connected through cast iron junction blocks, and the cast iron diagonals and lower chord wrought iron members were connected with pins. They used cast iron for the top chord, and diagonals and wrought iron bars and links for the lower chord members. Warren and Monzani were well known English engineers, and their design was for a truss that could be used as a deck or a through truss. Neville and a patent that was granted in England to William Nash in 1839 on a similar design. They based their patent on similar trusses that were built in France by Alfred H. Neither of these truss styles are what James Warren and Willoughby Monzani patented in 1848 in England.
Warren Truss with verticals to support top chord and deck structure.
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