#SCIENTIFIC DICTIONARY FOR MAC PROFESSIONAL#

#SCIENTIFIC DICTIONARY FOR MAC PROFESSIONAL#

His experiments on the effects of high-frequency, low-voltage alternating currents on animals led to the first high-frequency heat-therapy unit being established in 1892, and later to methods of physiotherapy becoming a professional discipline. For bacterial-research purposes he designed the first constant-temperature incubator controlled by electricity. A great increase in sensitivity was achieved by attaching a mirror to the coil in order to reflect a spot of light. This simple arrangement was independent of the earth's magnetic field and insensitive to vibration. It had been usual to suspend a compass needle in the centre of a large, stationary coil, but Arsonval's invention was to suspend a small, light coil between the poles of a powerful fixed magnet. In 1881 he made a significant improvement to the galvanometer by reversing the magnetic elements. His interest in muscle currents led to a series of inventions to assist in research, including the moving-coil galvanometer. His most outstanding scientific contributions were in the field of biological applications of electricity. His mathematical theory describing these phenomena provided the foundations for the development of electro-dynamics and his classic work ThГ©orie mathГ©matique des phГ©nomГЁnes Г©lectro-dynamiques was published in 1827. He investigated the forces exerted on each other by current-carrying conductors and the properties of a solenoid.

Included was a new hypothesis formed on the basis of his experiments on the relation between electricity and magnetism. Within a week he had prepared the first of several important communications on his discoveries to the Academy of Sciences in Paris. Observing a demonstration in 1820 of Oersted's discovery that a magnetic needle was deflected when placed near a current-carrying wire, AmpГЁre was inspired to investigate the subject of electricity, of which he had no previous experience. He became Professor of Physics and Chemistry at Bourg in 1801 and a professor of mathematics at the Ecole Polytechnique in Paris in 1809.

AmpГЁre was reputed to have mastered all the then-known mathematics by the age of 12.

Scientific dictionary for mac