Page "Negative feedback amplifier" Paragraph 16

The negative feedback amplifier was invented by Harold Stephen Black ( US patent 2, 102, 671, issued in 1937 ) while a passenger on the Lackawanna Ferry ( from Hoboken Terminal to Manhattan ) on his way to work at Bell Laboratories ( historically located in Manhattan instead of New Jersey in 1927 ) on August 2, 1927.

Black had been toiling at reducing distortion in repeater amplifiers used for telephone transmission.

On a blank space in his copy of The New York Times, he recorded the diagram found in Figure 1, and the equations derived below.