Hendrik Wade Bode
Harold Stephen Black
Francis Blake
Telephone transmitter inventor
American Bell Telephone | Associates: Alexander Graham Bell, Emile Berliner, Thomas A. Watson, Charles Williams, Jr.
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Francis Blake Jr. (December 25, 1850 – January 20, 1913) was an American inventor.
Francis Blake was born in Needham, Massachusetts on December 25, 1850, the son of Caroline Burling (Trumbull) and Francis Blake, Sr.
In 1879, he invented a carbon microphone for use in the telephone, and patented it shortly after Thomas Edison invented a similar microphone that also used carbon contacts. Blake used a carbon button design that initially would not stay in adjustment, but with later improvements proved to be workable. Alexander Graham Bell hired Blake and put him to work with Emile Berliner… More on Wikipedia →
