Although Peirce read law with Abraham Payne in 1859, he never went into practice. He was appointed assistant professor of chemistry in 1862 at Brown University and was promoted to full professorship in 1863. Two years later he resigned and devoted himself to research in chemistry at Harvard University and then Yale University.
Later life
Peirce took care of his personal estate after leaving the universities. He was wealthy and pursued hobbies and studies in his fields of interest, including electricity, photography, and the Aeolian harp.
Telephone innovations
The first telephones consisted of a wooden box which resembled a camera. The mouthpiece was a two-inch tube that had an opening into a cavern air chamber that had in the back a 4.5 inch round plate of sheet iron. This box telephone consisted a large "U" shaped, horseshoe magnet with an iron core attached to each pole. The soft iron core attachments were wound with a spool of small gauge insulated wire. The electrical current generated by the spools of wire related to the waveform of person's voice spoken into the mouthpiece. The whole mechanical gadget was bulky and awkward and did not respond well to a person's voice. Telephone experiments had been taking place at Brown University in Providence since the fall of 1876. The professors doing these experiments were Peirce, William Francis Channing and Eli Whitney Blake, Jr. By April 1877 they constructed the first portable telephone. This was made of two blocks of wood, one of which had a hole in it for the two inch round converging mouthpiece designed by Peirce. The other block of wood supported a horseshoe magnet made of two toy magnets. It had a sheet metal plate on top that was just touching an iron rod with a spool of small gauge insulated wire to pick up voice sounds. The pattern of electrical currents generated by the spool of wire related to a person's voice spoken into the mouthpiece. This telephone device weighed about twelve ounces and could be held in one hand when mounted on a handle. It reproduced voices better that the large box telephones made earlier and worked well over long circuits but with less volume. It did, however, serve as both transmitter and receiver and had to be moved from the mouth to the ear depending on whether the caller was speaking or listening. The handle telephone was embraced by Alexander Graham Bell and in June 1878 the Bell Telephone Company began production of its standard handheld model, combined with a wall-hung pushbutton to signal the operator, to sell internationally. The developmental professors at Brown University were given little credit for coming up with this hand-held model. According to the Proceedings of the Rhode Island Historical Society it was Peirce who came up with name "telephone". The wooden telephone set of a transmitter and receiver later became known as the "butterstamp" telephone, due to its resemblance to the wooden dairy butter stamps used at that time for impressing designs onto butter.
