Radio age research, manufacturing, communications, broadcasting, television (1941)

Page scan 00088 from Radio age research, manufacturing, communications, broadcasting, television

Record Details:

Title:
Radio age research, manufacturing, communications, broadcasting, television
Date:
1941
Publisher:
New York, NY Corp
Volume:
Radio age research, manufacturing, communications, broadcasting, television
Leaf #:
00088
Language:
Undetermined
Collection:
Broadcasting & Recorded Sound
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
Internet Archive
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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A copper-clad sheet of ploslic, on which electronic circuits will be printed by photography, is highly polished before the light-sensitive emulsion is applied. This gloss negative will be used to produce an unlimited number of accurate replicas in an automatic photo- printing machine. In this heat tank, the sensitized copper-clad plastic sheet is dried rapidly under a bank of infra-red lamps and over a row of gas burners. Here, the sheet of printed circuits, with all unwanted areas etched away by an acid bath, goes into a bake oven, as one of the final production steps.