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.
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 origins of the shepherd's leap may date back to the Guanches, the aboriginal inhabitants of the islands prior to the Castilian conquest period of the early 15th century. Canarian shepherds required a specialised means of transporting themselves safely across ravines and down steep embankments, and settled on the use of long wooden poles ...
After horses were introduced to North America, many Plains Indian tribes began to make larger horse-drawn travois. Instead of making specially constructed travois sleds, they would simply cross a pair of tepee poles across the horse's back and attach a burden platform between the poles behind the horse. This served two purposes at once, as the ...
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.
The earliest tracks consisted of wooden rails on transverse wooden sleepers, which helped maintain the spacing of the rails. Various developments followed, with cast iron plates laid on top of the wooden rails and later wrought iron plates or wrought iron angle plates (angle iron as L-shaped plate rails). Rails were also individually fixed to ...
An iron railing is a fence made of iron. This may either be wrought iron, which is ductile and durable and may be hammered into elaborate shapes when hot, or the cheaper cast iron, which is of low ductility and quite brittle. Cast iron can also produce complicated shapes, but these are created through the use of moulds of compressed sand rather ...
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.