Solo disponible en BuenasTareas
  • Páginas : 6 (1414 palabras )
  • Descarga(s) : 10
  • Publicado : 27 de julio de 2010
Leer documento completo
Vista previa del texto
* Lighting: The earliest forms of lamp poles were containers with hot coals. Then used to light torches of long duration, formed by bundles of twigs or splinters of resinous wood, tied and soaked in tallow or oil to improve its burning qualities.
It is not known the exact origin of the oil lamp, the lamp first authentic, but it was used extensively in Greece in the fourth century BC The firstlamps of this type were open containers made of stone, clay, bone or shell, in which fat or oil is burned. Later became fat or oil deposits partially closed, with a small hole in which was placed a linen or cotton wick. Fuel ascended the wick by capillary action and burned at the end of it. This type of lamp is also known as candle. Some great Greek and Roman lamps were many strands to give abrighter light. In northern Europe the most common form of lamp was a stone open vessel filled with tallow, which was introduced a wick. The Inuit (Eskimos) still use such lamps
*  Soap: In the first century AD, the Roman historian Pliny the Elder described the various forms of hard and soft soaps containing dye, known as rutilandis capillis, women who used to clean her hair and dyed in brightcolors.

The production of soap was common in Italy and Spain during the eighth century. Around the thirteenth century, when the soap industry came to France from Italy, most soaps are produced from goat's tallow, with beech ash providing alkali. After various experiments, the French developed a method for the manufacture of soap using olive oil instead of animal fats. By the year 1500, made hisdiscoveries in England. The industry grew rapidly in that country and in 1622 King James I granted him certain privileges
*  Pencil: One of the most popular tools for writing pen is weak. The pen strokes, unlike those made with some type of liquid, can be deleted easily. Its interior consists of a mixture of graphite (a variety of carbon) and clay. In 1795 he invented a formula of mixing powderedgraphite with clay, cutting the resulting product in small bars which are then baked. The hardness of these pencils depends on the ratio of graphite and clay: the more graphite used, the softer or darker the stroke of the pen. In 1812 the William Monroe invented a process still used today, whereby one could embed the graphite-clay mixture between two pieces of cedar wood
*  Contact Lenses:Already in 1887, the physician Adolf Eugen Pick (1829-1901) had developed contact lenses, small glasses (contact lenses) were applied directly on the iris, thereby correcting vision without anyone noticing it.But the glass in contact with the eye was irritating and dangerous. In 1954 there were plastic lenses, which proved to be practical and achieved popularity
*  Sewing machine: Theindustrialization in the eighteenth century brought about the mechanization of spinning and weaving, but the ancient task of sewing was done by hand.
In the nineteenth century perfected the sewing machine, the first of many other machines to alleviate domestic work to develop further the garment industry. The key was a sewing machine needle with the eye near the tip that could pass a loop of thread throughthe fabric without having to enter the entire needle. It was invented by the German Balthazar Krems, operator of a knitwear factory, which in 1810 built a machine for chain stitch. The needle moved up and down by turning a handle and a loop passing through the fabric, which was crossed by the following to hold
*  Typewriter: The first recorded attempt to produce a typewriter was made by theinventor Henry Mill, who obtained a patent from Queen Anne of Great Britain in 1714. The next patent issued for a typewriter was granted to the American inventor William Austin Burt in 1829 for a machine with characters placed in a semicircular wheel that was rotated to the desired letter or character and then pressed against the paper. This first machine was called the 'printer', and was slower...
tracking img