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Jacques Balmat carrying an axe and an alpenstock An 1872 diagram of an early ice axe, showing how the alpenstock was modified by the addition of a pick and an adze. An alpenstock (German: Alpen-"alpine" + Stock "stick, staff") is a long wooden pole with an iron spike tip, used by shepherds for travel on snowfields and glaciers in the Alps since the Middle Ages.
A tubular bridge is a bridge built as a rigid box girder section within which the traffic is carried. [1] Famous examples include the original Britannia Bridge over the Menai Strait, the Conwy railway bridge over the River Conwy, designed and tested by William Fairbairn and built by Robert Stephenson between 1846 and 1850, and the original Victoria Bridge in Montreal.
At the ends the verticals are four 2-inch (51 mm) rods. Rods 7 ⁄ 8 of an inch wide (21.2 mm) form the diagonals, double in each panel, [4] bracing the bridge against wind. [2] Latitudinal and longitudinal I-beams supported by the bottom chords provide a deck frame. They are trussed with two 7 ⁄ 8-inch wrought
Wrought iron is a form of commercial iron containing less than 0.10% of carbon, less than 0.25% of impurities total of sulfur, phosphorus, silicon and manganese, and less than 2% slag by weight. [18] [19] Wrought iron is redshort or hot short if it contains sulfur in excess quantity. It has sufficient tenacity when cold, but cracks when bent or ...
There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000 BC, it was the Hittites who first knew how to extract it (see iron ore) and develop weapons. Use of iron was mainly utilitarian until the Middle Ages; it became widely used for decoration in the period between the 16th and 19th century.
The colors and patterns of jockeys' silks have special meaning for horse owners. The silks for the historic 150th edition of the Kentucky Derby on May 4 at Churchill Downs are filled with a ...
One popular style is the star anchor, an anchor plate cast or wrought in the shape of a five-pointed star. Other names and styles of anchor plate include earthquake washer, triangular washer, S-iron, and T-head. [2] In the United Kingdom, pattress plate is the term for circular restraints, [3] tie bar being an alternative term for rectangular ...
The Wrought Iron Bridge Company was a bridge fabrication and construction company based in Canton, Ohio, United States.It specialized in the fabrication of iron truss bridges and was a prolific bridge builder in the late 19th century.
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