Kline, R.
Dept. of Sci. & Technol. Studies, Cornell Univ., Ithaca, NY;
This paper appears in: Control Systems Magazine, IEEE
Publication Date: Aug 1993
Volume: 13,
Issue: 4
On page(s): 82-85
ISSN: 0272-1708
References Cited: 20
CODEN: ISMAD7
INSPEC Accession Number: 4514418
Digital Object Identifier: 10.1109/37.229565
Posted online: 2002-08-06 18:43:18.0
Abstract
On August 2, 1927, Harold Black, a young Bell Labs engineer just
six years out of college, invented the negative-feedback amplifier.
Negative feedback soon allowed the Bell system to reduce overcrowding of
lines and extend its long-distance network by means of carrier
telephony. It enabled the design of accurate fire-control systems in
World War II, and it formed the basis of early operational amplifiers,
as well as precise, variable-frequency audio oscillators. The invention,
its development, the role it played in the founding of the
Hewlett-Packard company, and the themes it illustrates in the history of
technology are discussed
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