Showing posts with label Famous Invention. Show all posts
Showing posts with label Famous Invention. Show all posts

Saturday, August 06, 2011

Famous Inventions: BLACKBOARD

James Pillans invented blackboard in 1800s. He worked as the headmaster of the Old High School of Edinburgh, Scotland. This slate had wooden frames to protect them from breaking. The earliest blackboards were simply small pieces of slate. In place of chalk, students would use another piece of slate to write on the board. Written remarks would be erased with the use of a rag in order for the student to work on the next lesson. James Pillans took slates and hung them on the wall to teach them Geography and this brought him an idea of the blackboard. Mr. George Baron, a Maths teacher carried this idea to the United States in 1801. He gave maths presentations on the blackboard in the West Point Military Academy, a place where he taught. The idea got popular among the teachers as it saved time, enhanced understanding and helped cater a larger group at the same time.
Soon the blackboard production started in Maine, Maryland, Virginia, Vermont and New York and was supplied all over America. The blackboard became a common teaching aid for all the schools. And since then blackboards are part and parcel of all the classrooms all over the world. This invention brought revolution in the field of education.








Thursday, July 07, 2011

Famous Inventions: Bicycle

The name Bicycle dates from 1869. Various precursors of it were known as velocipedes, from a French name dating from the late 18th century. Basic two-wheeled vehicles driven by the feet were popular as early as the second half of the 17th century. In 1690 a Frenchman invented the celerifere, consisting of a wooden beam to which the wheels were affixed. The vehicle had no handlebar, the rider sat on a cushion on the beam and propelled and steered the machine by pushing his or her feet against the ground. In 1816 a German nobleman designed the first two-wheeled vehicle with a steering device. This machine was named the Draisine after the inventor’s name. It had a handlebar that pivoted on the frame, enabling the front wheel to be turned. In England these early models were known as hobby horses; the name dandy horse was applied particularly to the expensive pedestrian curricle, invented in 1818. The curricle was lighter in weight than the Draisine and had an adjustable saddle and elbow rest. It was patented in the United States in 1819. In 1839 driving levers and pedals were added to a machine of the Draisine type by Kirkpatrick Macmillan of Scotland. These innovations enabled the rider to drive the vehicle with the feet off the ground. The driving mechanism consisted of short cranks fixed to the rear wheel hub and connected by rods to long levers, which were hinged to the frame close to the head of the machine. The connecting rods were joined to the levers at about one-third of their length from the pedals. The machine was propelled by a downward and forward thrust of the foot. In 1846 an improved model of this machine, designed by a Scotsman, acquired the name Dalsell and was widely used in England.
The direct precursor of the modern bicycle was the French crank-driven, loose-pedaled velocipede, which became popular in France about 1855. The frame and wheels were made of wood. The tires were iron, and the pedals were attached to the hub of the front, or driver, wheel, which was slightly higher than the rear wheel. In England this machine was known as the Boneshaker, because of its effect on a rider pedaling over a rough road or a cobble stoned street. In 1869 in England, solid rubber tires mounted on steel rims were introduced in a new machine, which was the first to be patented under the modern name Bicycle.
The modifications and improvements of the next 15 years included the ball bearing and the pneumatic tire. These inventions, along with the use of weld less steel tubing and spring seats, brought the ordinary bicycle to its highest point of development. The excessive vibration and instability of the high-wheel bicycle, however, caused inventors to turn their attention to reducing the height of the bicycle.









Monday, April 25, 2011

Famous Inventions: WHEELS



The wheel is everywhere on all our cars, trains, planes, machines, wagons, and most factory and farm equipment. What could we move without wheels? But as important as the wheel is as an invention, we don't know who exactly made the first wheel. A wheel is a device that allows heavy objects to be moved easily through rotating on an axle through its center, facilitating movement or transportation while supporting a load, or performing labor in machines. Common examples found in transport applications. A wheel, together with an axle, overcomes friction by facilitating motion by rolling. In order for wheels to rotate, a moment needs to be applied to the wheel about its axis, either by way of gravity, or by application of another external force. More generally the term is also used for other circular objects that rotate or turn.
Wheels are very important chapter in human history and development. Wheels have very symbolic importance in all the cultures or religions or nations. We have our own national flag with Ashok Chakra in the centre. So wheels are most important invention made by humans. Wheels brought the world closer and made humans life easy. Today we can’t imagine our lives without wheels.













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