National Geographic : 1947 Mar
Miracle Men of the Telephone In This Improvised Laboratory Alexander Graham Bell Invented the Telephone The painting by W. A . Rogers shows one of the rooms used by Bell at 5 Exeter Place, Boston, Massa chusetts, as it appeared in March, 1877. Dr. Bell is shown discussing a telephone instrument with his assistant, Thomas A. Watson (left). The picture of the owl was painted by Mabel Hubbard, Bell's fiancee, in jest at his habit of working late. The first sentence transmitted by telephone was sent from this room. Singing into a Human Ear, Bell Recorded This Sound Wave on Smoked Glass Hoping to make photographs of sound-wave patterns to help teach his deaf pupils to speak, Bell secured a human ear through a friend. Dr. Clarence J. Blake, and attached a straw to it. When he sang into the ear, the straw recorded the vibrations of the eardrum on smoked glass. The wave pattern shown here is that of the vowel "Ah" sung to G, as indicated in the notation signed with Bell's initials (page 288).