Patent of T. McHugh for a guitar truss rod (1921). The patent is available here (after free subscription : http://www.freepatentsonline.com/1446758.pdf...
B suitable platform C longitudinal timbers D truss-pieces E intermediate timbers F upwardly-arched truss-piece G and G' supported upon axles H wheels...
Supplement containing the revised classification.. ( ) Author United States. Patent office. [from old catalog] Title Official gazette...Supplement containing...
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wood by using adjustable wrought iron rods instead of wood posts for vertical tension members. The Howe truss was favored by railroads for its rigidity...
wood by using adjustable wrought iron rods instead of wood posts for vertical tension members. The Howe truss was favored by railroads for its rigidity...
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