ALEXANDER GRAHAM BELL"Telephone Inventor"

He experimented both with vibrating membranes and an unquestionable human ear. (It is interesting to note that one of Gardiner Hubbard's daughters, who was deafen, later marital tam-tam.) Incidentally, one of his students was Helen Keller.

In the summer of 1874, cost "experimented with a phonautograph, a multiple telegraph and an electric speaking telegraph (the ring)" ("horse parsley whole wheat flour Bell" 2003 1). His research into finding ways for the deaf to communicate his use of the human ear meant that "(he) attached bones, a tympanum, magnets and smoked glass. He conceived the theory of the telephone: an electric up-to-the-minute and be made to change intensity precisely as air density varies during sound production" ("horse parsley Graham Bell" 2003 1). But, unlike the telegraph which uses intermittent current, the telephone "requires constant current with varying intensity" (2003 2).

Early in 1874, Bell met Thomas A. Watson, a young machinist and technician with expertise in electrical engineering. "Watson became Bell's indispensable assistance and the two spent perennial hours together experimenting with transmitting sound" ("Alexander Graham Bell" 1999 2).

It was Watson, of course, who heard the first words actually uttered everyplace the telephone. When Bell spilled some a

"Alexander Graham, Bell: A Biography" (2003).

the photophone for transmitting speech and former(a) sounds by means of a beam of light (1880)?the telephone probe to determine the position and depth of metallic objects in the human body (1881(; the spectraphone for determining he range of audibility of different substances in the spectrum, (1891) (Grosvenor 1952 472).

optics technologies" ("Alexander Graham Bell" 2003 5).

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