Alexander Graham Bell: Making Connections by Naomi Pasachoff

By Naomi Pasachoff

Examines the character in addition to the concept approaches which led this inventor to his discoveries that have helped our figuring out of the flora and fauna.

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Extra resources for Alexander Graham Bell: Making Connections

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When an object vibrates inward as it undulates, the air or other substance there expands into the area previously held by the object. This area of expansion is called a rarefaction. " Bell knew that sound waves consist of the pattern of compressions and rarefactions created by a vibrating object. He understood that if electric currents could be made to mimic a sound's pattern of compressions and rarefactions, any sound could be transmitted electrically. Bell knew that rapidly vibrating objects have a higher frequency than less rapidly vibrating ones—that is, they go through their cycle of vibration more times each second.

Blake that the instrument was less sensitive than a human ear, the medical specialist gave him an actual human ear, taken from a corpse in the morgue, to experiment with. Bell used that ear to construct his own version of the MIT instrument and was pleased with its increased sensitivity. At the end of the school year, Bell—once again exhausted from all his activities—went back to Canada to recuperate during the summer of 1874. He brought with him the various pieces of apparatus with which he had been 36 'Great Discoveries and Inventions making his experiments on the harmonic telegraph, as well his human-ear-based version of the MIT instrument.

Attached to the hairs are nerve fibers that send signals to the brain when the hairs bend. These signals are then interpreted as sounds. One of Bell's breakthroughs in developing the telephone came when he compared the movement of the eardrum membrane on the bones of the ear to the movement of a heavy telephone membrane on a piece of magnetized steel. Bell translated his understanding of the human ear into the telephone. A telephone transmitter acts just like an electrical ear, sending the speaker's words as electrical impulses.

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