Thought you all might get a little chuckle from an entry from Encyclopaedia
Britannica's WWW  site about printed circuits.  Especially check the last
line....  Should the IPC be contacting EB?

Electrical device in which the wiring and certain components
consist of a thin coat of electrically conductive material
applied in a pattern on an insulating substrate by any of several
graphic art procedures. After World War II, printed circuits
replaced conventional wiring in much electronic equipment, such
as radio and television sets, computers and control equipment,
and airborne and guided-missile electronic systems. They greatly
reduced the size and weight of the equipment while improving
reliability and uniformity over the hand-soldered circuits
formerly used.

Of the many techniques of manufacture, most involve photoetching
or stencil etching. The insulating board is coated with copper
and a protective film is deposited, photographically or by
silk-screening, in the pattern desired for the circuit.  The
unprotected copper is then etched away either in an acid bath
(for photographically deposited film) or by stencil-etching
methods (for silk-screen film). The remaining conductive copper
is left intact in the pattern of the circuit.

The development of far smaller and more compact integrated
circuits made printed circuits obsolete in the early 1970s.

Copyright (c) 1996 Encyclopaedia Britannica, Inc. All Rights
Reserved
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