Ads
related to: wrought iron shepherd poles for horses
Search results
Results from the WOW.Com Content Network
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.
The telegraph line would comprise more than 30,000 wrought iron poles, insulators, batteries, wire and other equipment, ordered from England. [9] [10] The poles were placed 80 m apart and repeater stations separated by no more than 250 km, [11] a major criterion being year-round availability of water. [12]
Developments in manufacturing technologies has led to changes to the design, manufacture and installation of rails, sleepers and the means of attachments. Cast iron rails, 4 feet (1.2 m) long, began to be used in the 1790s and by 1820, 15-foot-long (4.6 m) wrought iron rails were in use.
The Whipple Cast and Wrought Iron Bowstring Truss Bridge (locally known as the Normanskill Farm Bridge), is located near the entrance to Stevens Farm in southwestern Albany, New York, United States. It was built in 1867, but not moved to its present location until 1899.
The truss structure is a mixture of wrought and cast iron. The truss configuration is the design patented by Bollman as the "Bollman suspension truss" in 1852. Each span is 79.5 feet (24.2 m) long, 25.5 feet (7.8 m) wide and about 21 feet (6.4 m) tall.
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 ...
The bridge superstructure was constructed of wrought iron plate girders, with an asymmetric 'hogback' shape; the swing span extremities were 45 and 85 feet (14 and 26 m) from the centre line, with a 92.45-long-ton (93.93 t) counterweight; the maximum web depth was 14.5 feet (4.4 m).
The Wrought Iron Bridge Company specialized in relatively short-span iron truss bridges. Most were built for highway use, as the railroads were all privately owned at the time and employed their own engineers. The company supplied a catalog of bridge designs and mass-produced the parts to build these designs.
Ads
related to: wrought iron shepherd poles for horses