Category Scientist & Invensions

              He was the man who first proved that air contains two gases: oxygen and nitrogen. Also he established that when a substance is burnt it combines with oxygen in the air. This really moved chemistry into the modern age, because it explained for the first time what really happens during the important chemical process of burning. This great scientist, Antoine Laurent Lavoisier, was born on August 26, 1746 in Paris and is called the ‘Father of Modern Chemistry’. After completing his education, he first became a lawyer and worked as a tax collector. In his spare time he conducted research work.

              In 1766, he won a gold medal for his suggestions on how to light the streets of Paris. He was later given the job of a Gunpowder Officer. Lavoisier did a great deal of research on combustion. In 1772, he proved through an experiment that the ash from burnt metals is heavier than the original metals. Earlier people believed that when such things are burnt, they give off a substance called phlogiston. Lavoisier proved that during the process of burning something was added to the substance. 

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Morse code is a system of sounds that telegraphers and radio operators use to send messages through wire or radio. This involves a system of dots or short signals, dashes or long signals and spaces. Each letter of the alphabet, plus numbers and other symbols, are represented by groups of dots and dashes. The Morse code is named after Samuel Morse of USA who developed it in 1938. He also patented the telegraph in 1840 and was credited with the invention of telegraph.

The first message in Morse code was taped out in the United States over a telegraph line from Baltimore to Washington by Samuel Morse on May 24, 1844. The message was, ‘What hath God wrought’. Morse code can also be signalled by lights.

In 1837 Morse exhibited his first successful telegraph instrument. By 1838 he had developed the Morse code. But it was not until 1843 that Morse built the first telegraph line in the United States from Baltimore to Washington. In the following year, i.e. 1844, he succeeded in sending the first message. 

Telegraph messages are sent by pressing down a telegraph key. The dot is made by pressing down the key and releasing it quickly. This produces a rapid ‘click-clack’ sound in the receiver at the other end of the wire or the radio receiver. In the case of radio telegraph, the sound is more like a musical note. A short dash is held twice as long as a dot. A long dash is equal to four dots. The space between letters is sounded by ‘three dots’. A space that is part of a letter combination equals two dots.

Even today, in many countries, all telegraph messages and many new items are being transmitted by Morse code. Today most of the telegraph messages are sent by automatic printing telegraph machines called teleprinters, and by automatic facsimile like fax or electronic mail.

             A synthesis of the Quantum theory of Neils Bohr and the Field theory of Albert Einstein was evolved from a new theory of a great Indian scientist — Satyendra Nath Bose. The theory put forward by Bose explained the behaviour of subatomic particles. He showed that photons—the packets of energy, could behave quite differently from the assumptions of that time. Later Einstein further developed Bose’s ideas into a set of calculations which later came to be known as the ‘Bose-Einstein’ statistics. Though Bose and Einstein never worked together yet their long association was maintained through correspondence.

            A student of mathematics knows about Bose- Einstein statistics. This was a new type of quantum statistics and the particles to which this statistics is applicable are called Bosons, after the name of Bose.

           S.N. Bose was born in Calcutta on January 1, 1894. His father Surendranath Bose was a railway official. He went to Hindu School, Calcutta, for his primary education. There is an interesting episode which offers a glimpse into his genius. In school he once got 110 marks out of 100 in the mathematics paper because he had solved some problems in more than one way. His teacher predicted that one day he would become a great mathematician.

           After school he went to the Presidency College, Calcutta, in 1909. He became favourite with most professors for his brilliancy. He always stood first in all his exams—Intermediate, B.Sc. and M.Sc. 

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               The first gyroscope was devised by a German, G.C. Bohmenberger, in about 1810. But it was named thus by a French Physicist Leon Foucault in 1852, when he used the device to demonstrate the rotation of Earth. Its name has its origin from two Greek words: gyros mean turn or revolution; and skopein means ‘to view’. Therefore, gyroscope means, “to view the turning”. 

                This instrument is based on the same principle as that of a spinning top. We know that as long as the top keeps rotating, it remains upright and resists the force of gravitation. Similarly in a gyroscope, a wheel is mounted at such an angle to the rest of the apparatus that it is free to revolve around any axis.

                 According to the basic principles of motion — any spinning object resists an attempt to change the direction of its axis — the imaginary straight line around which it revolves. Thus you can move a gyroscope up, down, forward, sideways or backwards, and feel no resistance. But the moment you try to turn it through an angle you will meet opposition.

                A gyroscope basically has a heavy wheel. Most of its weight is concentrated in the rim. This gives the wheel a large moment of inertia. It resists attempts to change its position. If an attempt is made to tilt its axis, it will start moving in another direction, in a circle. This is known as precession. 

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               Homi Jehangir Bhabha a name considered synonymous with India’s atomic energy programme, was a great son of India. His contributions in the field of nuclear science gave India a giant leap in the field of science and technology. Consequently this led to the growth and progress in other fields. Indian atomic research has attained great heights today only due to the efforts of Homi Bhabha.

               Dr Bhabha was born on October 30, 1909 in Bombay in a wealthy Parsi family. He had his early education in Bombay. After graduating from the Elphinstone College and the Royal Institute of Science in Bombay, he went to Cambridge University for further studies. From there he got his engineering degree in 1930 and a Ph.D. degree in 1934.

During his stay at Cambridge University, he worked with Niels Bohr on Quantum Theory. Later Bhabha worked with Walter Heitler in the field of cosmic rays. He became well-known for his theoretical explanation of the phenomenon of Cascade showers in cosmic rays. He did significant work in identifying the elementary particles called mesons. 

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