the permanent way is the elements of railway lines: generally the pairs of rails typically laid on the sleepers 'ties' in american parlance embedded in ballast, intended to carry the ordinary trains of a railway. it is described as permanent way because in the earlier days of railway construction, contractors often laid a temporary track to transport spoil and materials about the site; when .
modern technology has allowed machines to enhance human power. human-powered transport remains popular for reasons of cost-saving, leisure, physical exercise, and environmentalism; it is sometimes the only type available, especially in underdeveloped or inaccessible regions.
these new rails enabled horses to pull even heavier loads with relative ease. but dependence on horsepower did not last for long. in 1804, the first steam-powered locomotive pulled 10 tons of ore and 70 people at 5 miles per hour. this new technology improved dramatically; locomotives soon reached speeds of 50 miles per hour. while the .
thomsonites, one of the rarer zeolite minerals, have been collected as gemstones from a series of lava flows along lake superior in minnesota and to a lesser degree in michigan, u.s. thomsonite nodules from these areas have eroded from basalt lava flows and are collected on beaches and by scuba divers in lake superior.
the tiangong kaiwu 天工開物 , or the exploitation of the works of nature was a chinese encyclopedia compiled by song yingxing.it was published in may 1637 with funding provided by song's patron tu shaokui. the tiangong kaiwu is an encyclopedia covering a wide range of technical issues, including the use of various gunpowder weapons.copies of the book were very scarce in china during the .
the core was a softer but more durable low carbon steel to stand up to the stress of tremendous impacts. the sides and back fell somewhere in between. all three types were forge welded together to create a weapon of unsurpassed complexity and deadliness. the technology was by no means limited to weapons of war either. items such as woodworking .
a portable engine is an engine, either a steam engine or an internal combustion engine, that sits in one place while operating providing power to machinery , but unlike a stationary engine is portable and thus can be easily moved from one work site to another. mounted on wheels or skids, it is either towed to the work site or moves there via self-propulsion.
their alumino-silicate construction is extremely durable and resistant to radiation even in porous form. additionally, once they are loaded with trapped fission products, the zeolite-waste combination can be hot pressed into an extremely durable ceramic form, closing the pores and trapping the waste in a solid stone block. this is a waste form .
the perpetual resource concept is a complex one because the concept of resource is complex and changes with the advent of new technology usually more efficient recovery , new needs, and to a lesser degree with new economics e.g. changes in prices of the material, changes in energy costs, etc. .
the history of technology is the history of the invention of tools and techniques and is one of the categories of world history. technology can refer to methods ranging from as simple as stone tools to the complex genetic engineering and information technology that has emerged since the 1980s. the term technology comes from the greek word techne, meaning art and craft, and the word logos .
the use of mirrors in mesoamerican culture was associated with the idea that they served as portals to a realm that could be seen but not interacted with. mirrors in pre-columbian mesoamerica were fashioned from stone and served a number of uses, from the decorative to the divinatory. an ancient tradition among many mesoamerican cultures was the practice of divination using the surface of a .