Occasional Electronic Publication No. 1 - Society for Industrial ...

Y-Z
Yandell, John & Joseph Johnson
11,818 Oct. 17, 1854 Combination of suspension and truss forms, more suspension bridge
than truss. Details for top and bottom wire chords of Pratt-like
configuration anchored to abutments. Main suspension cable from
towers to mid-span. Called “wire tress [sic] suspension bridge” in
patent specifications. Labeled “iron truss bridge.”
Yerk, James & George Heming – also see Zerk & Heming
34,023 Dec. 24, 1861 Iron Howe truss configuration. Cast-iron truss web members fabricated
with longitudinally-bisected tubes. Each web section casting consists
of a crossbrace and a segment of the upper chord. Patent is misfiled
under Zerk & Heming in the patent records.
Young, Edward
95,402 Sep. 28, 1869 *Methods for supporting suspension spans with two cantilevers.
Originally patented in England.
Zellweger, John
125,244 Apr. 2, 1872 *Framed arch. Labeled “improvement in bridges.”
145,545 Oct. 20, 1873 *Design details for vertical web struts composed of several members
connected by helix strapping. Labeled “bridge columns.”
Zerk & Heming – see Yerk & Heming
Zerk is a patent office misprint of James Yerk's name. The Yerk &
Heming patent is officially filed under Zerk & Heming.
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