William Francis Channing
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William Francis Channing was an American physician, scientist, and abolitionist known for inventing the telegraph fire alarm system and contributing to the development of the telephone. He published b
Portrait of Channing in 1847
Fire-alarm system installed at Boston City Hall in 1852.
1877 letter to Alexander Graham Bell discussing the most effective sizing and arrangement of bar magnet components for efficient sound transmission.
Henry Ingersoll Bowditch
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Henry Ingersoll Bowditch was an American physician and a prominent Christian abolitionist. Bowditch was born on August 9, 1808, in Salem, Massachusetts to Nathaniel Bowditch, a renowned mathematician.
